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Made an interactive page to visualize the discoveries behind optogenetics, honoured by this year's Nobel Prize in Medicine: classon.live/optogenetics.

I'm not affiliated with any of these YouTubers and have no financial interest in recommending them. These are just my personal recommendations.

I've made around 500 short SAT and maths videos for TikTok and YouTube. So I'll be honest about the medium first: a good video feels like learning. A lot of the time it isn't.

You watch someone solve a question smoothly, you nod along, and the next day you can't do the same thing on your own. That's not the creator's fault. That's how watching works.

So this isn't a list of channels to binge. It's a list of people I'd trust to explain one specific thing, plus where I'd point you inside each channel and how I'd use it.

I picked them mostly on likes and on the comments. Not the "taking it tomorrow, wish me luck" comments. The ones where a student says what actually clicked, or argues with the method. Those tell you far more than the view count.

Before you open YouTube

Do a Bluebook practice test first. Then go through your wrong answers and write down, in one sentence, what went wrong. "I didn't know how to find where two graphs cross" is useful. "I'm bad at maths" isn't.

Now you know what to search for. Everything below is organised around that idea.

James Lu SAT: when you're ready to go deep on Desmos

The Last SAT Desmos Guide You'll Need · 24,313 likes · 1,665 comments

This is almost two hours long, and it's worth it if you already know the basics of Desmos and want more ways to use it. He goes into regression, tables, number of solutions, circles, and ends with a flowchart for choosing a method.

Don't watch it start to finish. Use the chapters. Pick the one that matches a question you got wrong, watch it, then go and redo that question.

One thing I'd ignore: the description puts percentages on how much of the SAT each trick covers. I haven't seen those numbers verified, and I'd never decide what to skip based on them.

Hayden Rhodea: one course for both sections

Digital SAT Prep Course · 20,358 likes · 836 comments

Seven and a half hours, Reading and Writing plus Maths, all in one place. If you're starting from zero and feel overwhelmed by the number of resources out there, this gives you a single route through the whole test.

Two cautions. It came out in August 2023, so check any test logistics he mentions against Bluebook today. And seven hours of video is a trap if you treat it like a series. Watch one chunk, then do questions on that topic before you move on.

LearnSATMath: the best first Desmos video

The only SAT Math Desmos Guide you'll ever need · 19,935 likes · 906 comments

If Desmos still feels like a box you type numbers into, start here. Eric explains things clearly and the editing keeps you awake, which matters more than people admit.

Two spots to watch carefully. At 9:17, he has corrected the answer himself: both B and D work. And around 24:26 he gives a quick rule that squares or absolute values mean two solutions. Don't memorise that. It's not always true.

My favourite part is near the end, around 31:26, where he talks about when the calculator isn't the right tool. Most Desmos videos skip that bit.

Tutorllini Test Prep: one skill, ten minutes

Desmos Lesson #2: Systems of Equations · 3,529 likes · 130 comments

Kyle's lessons are short and each one does one thing. This one shows you how to type a system straight into Desmos without rearranging it, zoom in on where the lines cross, and read off the coordinate the question actually asked for. That last step is where a lot of students lose easy marks.

He tells you to pause and try it yourself at 2:09 and at 3:40. Actually do it.

A commenter pointed out that the first example is faster by hand, and they're right. That's not a reason to skip the video. It's the lesson: learn the graph method, then always ask whether algebra would be quicker.

Penguin Test Prep: for the Reading question type you keep missing

SAT Reading Hacks · 2,053 likes · 165 comments

Robert sorts Reading by question type, which is how you should be reviewing it too. If your mistake notes say "text structure" three times, go to that part.

The comment I liked most was from a student who had studied for ages and only realised here that, in "overall structure" questions, the right answer describes the parts in the same order as the passage. Small idea. Saves a lot of time.

This video is about Reading. For grammar and punctuation you'll need something else.

Scalar Learning: more Desmos examples across topics

Desmos overview for the Digital SAT · 1,880 likes · 128 comments

Huzefa moves quickly through equations, inequalities, percentages, data, quadratics and circles. It's a good second opinion after LearnSATMath, because seeing the same tool used by a different teacher on different problems helps it stick.

One student said the useful bit for them was finding out Desmos can calculate a median. If data questions slow you down, that alone is worth the twenty minutes.

Be careful browsing the rest of the channel. Some older videos are for the paper SAT, which is a different test.

Strategic Test Prep: for inference questions that feel like guessing

SAT Inference Question Strategies · 1,733 likes · 79 comments

Laura's approach is to slow down and map the passage: what happened first, what's being compared to what. On passages with a sequence of events, a quick timeline makes the answer obvious.

It won't work on every inference question, and I'd ignore the "80 points" in the title. But the comments are interesting. Students argue about whether to jump ahead to easier questions or work straight through. My view: try both on a practice module and keep the one that gives you more right answers, not the one that feels better.

How I'd actually use these

Pick one main channel and one backup. That's enough. Seven channels is a list, not a plan.

Then for each mistake:

1. Find the part of a video that covers it.
2. Pause before the solution and give it a go.
3. Watch how they did it and note where your thinking split from theirs.
4. Close the video and do a new question of the same type.
5. Come back to it a few days later.

Step 4 is the one people skip, and it's the only one that tells you if you've learned anything.

If you'd rather read than watch, our Desmos SAT guide and the Reading and Writing mistake log cover the same ground in writing.

Likes and comments checked October 4, 2026. They'll have changed by the time you read this.

As of September 28, the October 3 SAT is five days away. At this point, another giant stack of random questions is unlikely to be as useful as finding the mistakes you still repeat, fixing a few of them, and making sure you can actually enter the test room with a working device.

Here is the distinction that matters: we know the test date, format, and tested skills. We do not know the questions you will see. An “October SAT prediction” that names particular algebra problems or passages is guessing. Use the published test design and your own practice results instead.

What is confirmed for October 2026

College Board lists the SAT Weekend test for Saturday, October 3, 2026. The regular registration deadline was September 18 and the late-registration deadline was September 22, so registration for this sitting is closed. The scheduled student score-release date is October 16. A score reaching a college can take longer; check each school's policy rather than assuming the release date is its receipt date.

There is also an October 1–30 SAT School Day window. It is not a second open registration period for the October 3 weekend test. Schools arrange School Day testing and set the date for their students. If your school is testing in October, ask it for your actual date and instructions. College Board lists the separate windows and deadlines here.

The test still has two sections: 54 Reading and Writing questions in 64 minutes, then a 10-minute break, then 44 Math questions in 70 minutes. Each section has two separately timed modules. Your second module depends on your first-module performance, and you cannot return to a finished module. See the official structure. A difficult-feeling second module is not a score report; students cannot reliably infer a score from that feeling.

Where a final week can help

College Board's Reading and Writing design covers four domains: Information and Ideas, Craft and Structure, Expression of Ideas, and Standard English Conventions. Its published approximate shares are 26%, 28%, 20%, and 26% respectively. Math is divided among Algebra, Advanced Math, Problem-Solving and Data Analysis, and Geometry and Trigonometry, at approximately 35%, 35%, 15%, and 15%. These are test specifications, not a forecast for your personal October form.

That distribution suggests a sensible rule: if your last practice test shows repeated missed linear equations, transitions, or sentence boundaries, work on those before hunting an exotic topic. But do not study a domain merely because it occupies a large share. Your own recurring errors decide the priority. If you already handle algebra confidently but lose points on graphs or inference, the weaker skill is the better use of an hour.

Make the diagnosis specific: “I chose a transition by tone instead of logical relationship” is something you can practise; “I am bad at Reading and Writing” is not. Our Reading and Writing mistake-log method shows how to turn a missed question into a next action. For Math, the common-problem collection can help you locate a worked example of the skill you keep missing.

If Reading and Writing is your priority, choose one relevant worked lesson from our 50 focused Reading and Writing decisions. Use it to repair a specific mistake, then check the same skill with official questions.

One complete Bluebook practice test is enough for a useful diagnosis this week if you have not taken one recently. In My Practice, read the explanation for every missed or guessed question, including why the tempting wrong choice fails. College Board's Student Question Bank lets you filter by section, domain, skill, and difficulty for a small follow-up set. Keep the practice focused enough to finish and review it.

A five-day plan that leaves room to think

When	Main job	A concrete finish line
September 28	Review your latest timed test, or take one Bluebook test if you lack a baseline.	Name two repeated errors in Reading and Writing and two in Math.
September 29	Fix the most frequent Reading and Writing error.	Answer a short set on that skill, then explain why each wrong option is wrong.
September 30	Fix the most frequent Math error.	Work a short set without hints; check the equation, units, or graph against the question.
October 1	Practice one timed module or a mixed short set.	Notice where you spend too long; use Bluebook's mark-for-review tool and move on when stuck.
October 2	Do a light review and finish test logistics.	Bluebook setup complete, admission ticket ready, physical ID checked, device charged.

These are suggested activities, not a required schedule. If you have already taken several full tests, reviewing your existing mistakes may be better than adding another. If you start on October 1, compress the skill review; do not skip device setup to fit in extra questions.

Inside each module, a workable habit is to answer the questions you can solve cleanly, mark the ones that need a second look, and use the remaining time to return to them. Bluebook allows you to move among questions within the current module before its timer ends. It does not let you carry unfinished questions into the next module. College Board explains the test-day tools and navigation.

The preparation that is easy to forget

Between one and five days before test day, open Bluebook on the device you will bring and complete exam setup. This downloads your test and produces your admission ticket. A practice test alone does not complete that step. Check device readiness, especially if your school manages the laptop or Chromebook; our fall 2026 device guide covers the recent requirements in more detail.

Pack a fully charged approved device, admission ticket, physical acceptable photo ID, and a pen or pencil for provided scratch paper. College Board says a printed ticket is preferred. Check that the name on your ID matches your registration. A calculator is optional because Bluebook has one in the Math section, but any calculator you bring must comply with College Board's policy. Use the official bring-list for the final check.

On Friday night and again on Saturday morning, check your test center and Bluebook for changes. College Board's closing notice says centers can change on short notice. Its sample Saturday schedule has check-in at 7:45 a.m. and doors closing at 8 a.m., but your admission ticket controls your actual arrival details.

The point of this week is not to learn every SAT topic by Friday. It is to turn a few known mistakes into reliable decisions, rehearse the digital timing once, and remove preventable test-day surprises. If your October registration is not in place, use the same diagnosis-and-review method for the next date; the SAT calendar lists the November and later deadlines.

I work hard!

I give you enough space, but I never let you go!

Took this just out of my house.