Take a mock test a day ( a lot of questions are repeated from previous year papers as well )
Just revise whatever you’ve studied
Read biology 11th and 12th ncert 2-3 times (you can score 300+ easily in biology with just the ncert) there are only 3-4 chapters that you need to study out of ncert. Seriously, don’t waste your time.
Revise all the formulae of physical chemistry, look at all the exception questions, revise all the imp concepts of organic chemistry, pick up inorganic chem at last.
Now coming to physics, you’ll be able to solve questions only if you’ve practiced whole year,so just revise what chapters you’ve studied most thoroughly