Hello

NCERTs are the best books to clear the basic concepts. If your fundamentals are strong, you will not face much difficulty in the exam. You should also solve other advanced text books for in depth knowledge.

One should not limit to just building concepts, as it is equally important to enhance problem solving skills through solving sample papers and question papers.

During the last few preparation days, you should also focus on revision and solving mock tests to anaylse your preparation.

You can enroll for the VITEEE Knockout to prepare for the exam more effectively and smartly using the smart study material (which includes chapter wise, concepts wise, most asked and most difficult questions), Advanced Test Series based on VITEEE Pattern (which includes unlimited chapter wise test, subject wise test and full mock test), adaptive time table, performance analysis (which includes Prepmeter, Strength Sheet, Weakness Sheet, Skills Graph) and Rank Predictor tool.
Go through the link below to check the details

http://bit.ly/2Uyp81K

Good Luck!