GRE Preparation

Quantitative
The portion for the test is a repeat of the AIEEE , JEE and 12th standard portion. However, the question types asked here are different, with there being three/four distinct types that are always asked. It is best to familiarize yourself with these types by attempting a mixed bag question set. I did two problem sets of 60 questions each (total 120 questions) from Kaplan's Book (Kaplan GRE Premier 2013 (With 5 Computer Adaptive Practice Tests + DVD) - ) (*ahem* copies may be downloaded from internet) . Once you have gotten yourself acquainted with the questions, you might want to focus on specific topics that you might have forgotten, or you need more drill in . Barron's book holds your hand well through all the topics for Quant with lots of basic concepts and solved examples.
Another problem one might face is how to avoid making silly mistakes. The only way to solve it is through timed test practice.
Note: GRE is an adaptable test so the 2nd section's difficulty is determined by how well you perform in the 1st section. Hence if you are aiming for that 170 in Quant and you think Quant is generally very easy , buckle up for your 2nd Quant section because it is going to be a test of your time and skill.
Verbal
If you are an Indian Engineering student, this is where you are going to be spending most of your prep time.
There are two components to your verbal prep :
1) Improving your vocabulary
2) Practicing specific question types.
There are three main question types:
1) Sentence Completion 2) Sentence Equivalence 3) Reading Comprehension and Logical Reasoning
The first and second type can be handled by just mugging up words and learning how they are used in context.