If you have not been using OG, I would strongly suggest go for OG first.
You can start with the Main OG, or go straight with the 4-book bundle. The 4-book bundle includes the Main OG and sectional review guides for Quant, Verbal and DI. There are 1,700+ questions available from the bundle, which is usually sufficient for most people.
Only when you exhaust all the questions from the latest edition of OG, then you think about 3rd-party question banks. In fact, there are other official questions available for free on GMAT Club, such as older editions of OG, or retired questions from GMAT Classic mock exams.
AbhiKuls
I have completed
TTP course, post completion to improve my score I need some practice material or question bank.
Few names I came across apart from original GMAT site are Manhattan and Bloomberg.
Please suggest me some good practice material.