Hi Samuelson!

It is really unfortunate that you are facing such a problem at this point in time. But there is something that you can do. I suggest that you become very perfect with the NCERT textbook. You'll have to read each and every chapter very carefully, especially the inorganic chemistry chapters and organic chemistry chapters. Coming to the physical chemistry chapters, you need to practice as many problems as possible from the textbook. Finally, try to solve as many previous years papers as possible. Always remember that to ace in chemistry, you need to have a good memory power and retaining ability. 

If you still have any doubts or queries, please comment below!

Let me know if this answer was helpful and all the best for your future!