u/Frosty-Collection671

So i just joined this subreddit and im hoping to get some guidance from seniors or anyone willing to help. Im in class 12 and i have been preparing for paper one since last year but now i am planning to shift focus to paper 2a (its more aligned with my personal interests than Btech) and i genuinely have no idea where to start/how to prepare and what all to do. is there any good online classes (ive found only pw so far) or prep books or strategies and tips? ty in advance..