how to study in 12 sci in last 4 month

hello,

see science is really hard and if you did not study well from the beginning of the courses , it will be really difficult to cover in last 4 month. how ever you can make suggestion and study smartly to achieve at least 60% marks. every board has some model test paper and books available. prepare at least 12 papers and make notes of that questions and see how many of questions coming from each chapter, the chapter which has less question comes you may leave them now, if you get some time in later you can prepare for that.

hope you may understand.