Hello

The ratio of class 12th syllabus is comparatively more in VITEEE. However, it is important for the candidate to study all the topics to secure a good rank in the exam.
Check the complete syllabus-

https://engineering.careers360.com/articles/viteee-syllabus

Class 12th NCERT books are the great study material to prepare for the exam and build fundamentals. You should also refer to advanced books for in depth knowledge.

For preparation of the VITEEE exam, 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!

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Most of these entrance tests follow the NCERT syllabus,If you are following the same its good but no one can say that's enough,so try to solve some sample question papers as well(These sample question papers are easily available online).

If you aren't following the NCERT book,you might face some problem with the type of questions.So you must solve some sample question papers to get accustomed to the pattern of questions.

Hope this answers your query.