gng help

first things first, i go to narayana. it's hell as is. i just got moved to a better section where all these nerds be studying 24/7. they be gettin 60+ out of 180 in the weekend tests which is considered AMAZING performance. some of these mfs get 90-100 too. there are 50 ish students in my class and i'm usually bottom 10. i got 11 in the recent test. i went from being a top student in 10th (also in narayana) to THIS. i mainly struggle in Physics, and I don't understand anything. Math is okay,Chemistry is ass but it's not because I don't understand it, it's mostly because I don't practice enough chemistry. I struggle with everything in physics. I don't even know the basics, and they're teaching us Angular SHM right now. I studied physics all of last week and thought i could do well for ONCE but i got -2/60. heck i don't even know where to apply what. apparently mechanics is super important (which i can tell it is), and i need to catch up on it ASAP to even stand a chance against these mfs let alone all of india. any help/advice is appreciatedd!!!!