I don't know what to do

Im going through a bit of a rough patch for wace I want an atar of 80 however I've been scoring 53 for English 56, for mathematics applications 64 for psychology and and 53 for bme these are my top 4. I dont know what to do l havnt been getting proper sleep cause of stress, lm a hard-working student is there any advice anyone can give please!!??