If you are preparing for GATE exam then preparing for VITMEE will be lot easier. Now, to prepare for the English section which is of 20 marks you can refer to Objective English by Arihant which is the best book for preparing English for any competitive exam. Also, you can download the GradeUp app where you can give short tests to increase your speed and efficiency.

Now, to prepare for the technical section which is of 80 marks, it is best to refer to your graduation books as you need to have a very good knowledge of the theoretical portion. Here, in the exam the questions are mainly theoretical based and direct. So, you can refer to GATE or IES  books by Arihant or Made Easy publication for practice.