Dear Vamsi,

In order to start your preparation you should be aware of complete Syllabus, exam Pattern and Important topics.

To have an idea about the exam pattern and level of questions you can refer previous year papers 

VITEEE paper is based on concept, speed, accuracy, time management and decision making power.

For concept refer NCERT books, For accuracy and time management practice a lot of questions. You can solve MCQs and complete mock test series.

You should make your proper time table according to your comfort. So, you can complete your syllabus and you get proper time for revision.Focus on the important topics which carries more weightage in the exam. 

All the Best!!