Hello Rupam,

Well there are individual differences and people vary in capabilities. Having said that, there is no exact time to start preparing for GRE. It varies from person to person. Since the score is valid for 5 years, some people choose to take it very early, whereas some people leave it for the end. The ideal time to take the GRE would be around 1 to 1.5 years before you intend on joining a university. To be on the safe side, you should start preparing for the exam around 3 months before you take it. If you give the GRE at an early date, you will have sufficient time to research your options and narrow down on a probable list of universities. Again, it completely depends on the person.

Hope this helps. All the best. 

Hello Rupma,

You should start the preparation after 4th semester. You will get summer vacation after 4th semester in that vacation you need to figure out your course, syllabus and prepare a timetable for yourself and start working according to that. 2 to 3 hours are sufficient for the preparation of GRE examination.

Hope it helps you

Thank you