Your target is 55-60 to get 30,000  below rank.

So focus on quadratic expressions, sets and learn the formulas of statistics, introduction to 3d geometry and also do some solved problems, at least 5 of each chapter in maths

Coming to chemistry learn structure of atoms and solutions...at least 5 to 10 questions from above chapter

When we come to biology, read cell structure, digestion and absorption, biomolecules ...at least 5 to 10 questions from above chapters

Coming to physics learn formulas of gravitation and thermodynamics.. Atleast 5 questions from the above chapters

You should give every subject a day (because you will write this exam only once, so concentrate on these 7 days) that means in first four days read the theory and next three days do some problems...

I hope you got the information.. So, start it !