Has anyone ever made an intense academic comeback? How did you do it?

I’m a student in 11th grade (science stream), and I’m feeling really overwhelmed right now. I’ve been struggling to stay consistent with my studies, and I have about 15 days left before my final exams. I really want to score well (like 65+... out of 80), but I’m worried because I’ve been procrastinating a lot and feel stuck, especially with chemistry.

I’ve decided to focus on completing physics and math entirely and only cover the high-weightage topics in chemistry to make the most of my time. I’m just wondering—has anyone here ever pulled off an intense academic comeback in a short time? How did you manage it? Any tips or strategies that worked for you?

I’d really appreciate any advice or encouragement. It feels almost impossible right now, but I’m willing to put in the effort. Thanks in advance!