I've manhattan 5th edition and official guide 13th edition. Is it ok to prepare from it or should i get newer versions.
Those versions are perfectly good to prepare for the GMAT.
Since you have those resources, you might consider signing up for Beat The GMAT's free 60-Day Study Guide (https://www.beatthegmat.com/mba/gmat-guide). Over 40,000 Beat The GMAT students have already done so.
Each day, you'll receive an email with a series of learning activities that guide you, step-by-step, from Day 1 to test day. This will ensure that you will cover everything that the GMAT tests.
Here's an outline of all 60 emails: https://www.beatthegmat.com/mba/gmat-guide-outline
Cheers,
Brent














