We can just show you the right path but even after that no can give you guarantee of scoring 300 marks.Anyway try to solve as many questions as you can .Give equal time on all subjects.You should learn atleast 10-12 inorganic reactions daily. Organic name reactions machanism is important .Main thing is time management and accuracy for that you have to solve question papers .If you are giving some institute test series then it is good enough bt if not you can download practice sets from net also.you should be consistent in your studies

Hello Prajwal,

The main thing is that you have to build your concentration level, then only you can stay focused on your goal. I would like to say that please limit the study time between 10 to 12 hours and please increase your concentration and speed of reading, understanding and solving the problems then you will not face any kind of difficulty.

For preparation of exam, the most important thing is your confidence after that you should know the whole syllabus and make your plan properly for learning new chapters, solving the numericals and revision. All three things should be the part of your preparation strategy in daily routine.

Your basics in Physics, Chemistry & Mathematics should be very clear upto 12th std. You should read the NCERT books for basics. Then HC Verma for Physics, RD Sharma for Mathematics, OP Tendon for Physical & Inorganic Chemistry, and Organic Chemistry of "Arihant Publication" for detail or extra knowledge. 

You should also try to solve the previous years question papers, this helps too much and you should also give the mock test to rectify yourself and build your confidence level. In this way, you can make it possible.

All the best