Hello! The pattern of VITEEE is based on NCERT and many questions come from NCERT as well. But you will have the ability to solve these questions only when you practice various questions beforehand from various other sources.For practicing other than NCERT, you can refer to books like:

HC Verma/DC Pandey/SL Arora(Physics)

RD Sharma(Maths)

For chemistry,you can refer your NCERT.

According to me,what is more important for VITEEE paper is to practice all the previous year question papers. They are the perfect way of practicing for your exam as they give you an idea of the pattern. The key to crack VITEEE is to first make your base strong by preparing from NCERT and then refer to any other books. Be consistent with what you do and focus more on smart work than hard work.

All the best!