Good tests must buy for practice

the 6 GMAT Official Practice Exams (each of which can be reset at least twice), formerly known as the GMATPrep exams, are the most realistic practice exams on the market. However, the scoring is less reliable, and most will find the real GMAT to be a bit harder, especially on the high end of scores. Plan to spend about two to three months and 100–120 hours reviewing material and practicing regularly. The top scorers on the GMAT spend 120+ hours, on average, studying for Test Day over a period of time. Apart from the first mock test that you take right in the beginning, you should plan to take at least 2 mock tests towards the end of your preparation. You may take more mock tests if time permits. You should have a minimum of 3 days between 2 mock tests.