RJVBI am sorry to hear that your GMAT did not go well as you expected.
I am assuming that your question about book recommendation is for both Verbal and Quants.
In general, when you are preparing using books,
MGMAT Guides are recommended by many test takers. The guides also comes with 6 practice tests and
MGMAT tests are rated highly by many test takers.
Also there is
Powerscore CR Bible - this is very highly rated book for CR.
Apart from the materials listed above, GMAT Club has very excellent materials especially for Quants. You should try out the below given materials in the order listed
1. GMAT Club Math book
2. GMAT Club - Quant Megathread [This is the one of best posts for Quants in my opinion]
3.
GMAT Club TestsGMAT Club tests are very highly rated by high quant scores, so do check it out.
All the above posts are about materials, but only studying will get you only so far, practice is the key for consistent improvement.
GMAT Club has an excellent project called Project Butler , where 2 questions will be posted daily under each section and you can learn a great deal by answering them and also learning from other test takers and experts. So every day try to answer daily questions posted in gmat club.
You can find the review of best books for GMAT Prep in this page -
https://gmatclub.com/forum/best-gmat-bo ... ml?fl=menuAll the best for your preparation