3 Common GMAT Prep Mistakes (kiwibox.com)
You will come to know your weaknesses, and you can get over them slowly and gradually when you give more and more tests. There are numerous online courses that come with promo codes for your benefit. For instance you can use Veritas referral code and avail Veritas discount on your Veritas Prep package of online course and tests. Just make sure that you are learning from each question and each test that you go through.