Hey Raju

I wish you had mentioned the exam for which you are preparing. I can very well understand your problem since I had gone through the same problem when I was preparing for college entrance tests. The best thing you can do right now is to start with each topic online, as in, watch videos for each chapter (On youtube or Vedantu or Unacademy) and solve the past year questions.I personally would advice you to go for Vedantu. You can also use toppr app where they will solve the questions you give them.

I hope this helped. All the best. Incase of any more doubts please feel free to ask.