Okay let’s talk strategically..You have 3 subjects .Physics is most difficult (for many).Most scoring subject is biology and you have just 2 months!!Anyone who is preparing will always go for the score rather than knowledge..obviously knowledge will bring you the scores but the point is where to invest your energy?Seeing the amount of time given ,I would recommend you to focus more on biology part which will fetch you maximum marks since you are starting from zero level. Let me break my answer into points:
1- Go through all the chapters of ncert biology. Don’t do anything extra since the time is less.
2-In chemistry I will not ask you read all the chapters of ncert since nobody can(from zero level).Just read those last chapters from which direct questions are asked like chemistry in everyday life..pollution..surface chemistry.. biomolecules..you will understand once you go through the contents what I am talking about.
3- In physics just solve question papers or question bank.clear your doubts. In the process you will learn much.
4-join allen test series . And give the tests too!! Analysis is more important than giving the test itself. Mark my words. Analysis is very very very important. Never leave any question unanswered. Take help from teachers or books.