Hi Pranay,
It really depends on the kind of coaching you're up for.
Most of them start with the basics. If you feel that you're really out of touch, out of personal experience, I'd suggest you brush up your basics. Get Quant-ready. But then again, if you're an engineer, from India, you shouldnt have any problems. xD
Focus on the verbal part, because honestly, that is something that determines your score towards the end.
I'm not an expert; I have just given my GMAT, after preparing for a month, and I do have a 700+ score. It is not that difficult.
Start off by deciding on a date. Even if you don't book a date, you might want to finalize it in your head, mark it on your calendar, whatever.
GMAT club is a great hub, but rather than wasting your time scouring through random questions, finish something that gets your basics right. The
OG, for example.
Start with the diagnostic tests. To make it more realistic, try the online
OG diagnostic tests. You can tell from these if you really need coaching.
For quant, attempt questions in sets of 40, with a timer. And gradually try reducing the time you take. Try to do each question in less than two minutes.
DS questions typically take more time. But then, it all depends on the level of questions.
So yes, finish the
OG first. They're sub-700 questions- most of them anyway. But finishing the
OG gives you the confidence you need.
If you have a doubt, GMATclub your way to the solution.
For verbal, you might need help, if your diagnostic score doesn't come out too good. Certain books are recommended. For example, most GMAT clubbers vouch for Manhattan SC Strategy guide for SC. The Powerscore Bible for Critical Reasoning is good. A little research on your part can go a long way in helping you achieve your goals.
All the best!
Neutronskye