i get 3-5 hours of sleep a night

like the title says, i am incredibly sleep deprived. i wake up at 6 am and sleep around 1 or 2 am due to all the responsibilities i have. i've been advised to drop some of what im doing, but im afraid that if i do i will be ruining my chances at a top school. my competitive hs has a very big "grind-culture" and im terrified of falling behind. i know it might sound silly to some but the anxiety is real and i don't know how to cope with it.

i'm also consuming a concerning amount of caffeine each night... any helpful advice?