5 months is a decent timeline for a 700+ score in GMAT.
I would suggest you prepare in the following manner:
1.
Resources:--
Official Guide for GMAT (Latest version)
- GMATClub verbal and quantitative guide books
-
Manhattan prep guide books for CR, RC and SC in verbal, and PS and DS in quant.
Manhattan prep materials also give you access to a set of GMAT mocks, and will be useful in the coming months.
2.
Strategy:-a) Start with a GMAT diagnostic test. Use
the Official guide's diagnostic test to understand your relative strength in different areas of the GMAT
b) Start your preparation by building concepts in the relatively weaker areas, and brush up concepts in strong areas
c) Practice questions strategically. Since you have the luxury of time, I would suggest to pace practice out well. Remember that giving too much time to GMAT can become a bane, as you tend to forget concepts. Keep this in mind and practice well
d) Towards the end you
must avail of GMATPrep full length mocks, as they give the closest estimate of your scores
e) Start giving mocks when you reach a decent level of accuracy, improve your score in steps
Once you reach above your target score, take the plunge.
Good luck in your preparation.
Thanks,
Romit
(On behalf of TopTier)