Hello,

NET lingustics Guide Book is available in online to buy. If you are looking for a free PDF then that is hard to get. You can get previous year sample papers from browsing online. That will surely help you out in your practice to check your performance. The important work to do is you have to learn , understand and realize it. It will be easy for you to remember.  books given by your board is enough for the exam study materials are made from them which have selective portions. You can find them too is you study it and analyze with previous year papers.

if it is hard then draw flow chart, draw figure to remember as you will capture it faster. cover them multiple time.

Hope it helps!