Hey Praneet,
This is a common problem that can occur when we spend too much time on any one thing. What's important is to break up your studies with refreshers from previous subjects. One day to do this is by taking practice tests every week or so - this will force you to use all of your knowledge. Another is to do a quick review of all of your previous studies before starting each new section: in order to so this, you're going to want to write short summaries of the important points and tips you learn as you go along.