u/Aggressive-Part3225

I got less than 3 weeks left until the exam and I am barely scraping A’s I had bad maths teacher and I usually find maths easy because Im naturally good at it and rely mostly on teachers to learn but my teacher this year was so bad its starting to affect me
Aside from that, any tip or help to get me that A comfortably or even an A*? I have been doing past papers but some stuff i get stuck at and don’t know how to solve or work out and I find it hard to learn some stuff quickly and keep in memory
Thanks in advance for any assistance