Hi Pravela!
The GMAT is a computer adaptive test – so Grockit's score predicting CATs, like the actual GMAT, are
not based on the
number of questions you answer correctly, but on the
difficulty of the questions that you answer correctly and incorrectly.
So, it's quite possible that you answered more questions incorrectly on Grockit but received the same score that you did on the GMATPrep test. Both tests are designed to pinpoint your skill level based on how you perform on each question, not on your total correct/incorrect on the test as a whole.
It's a good sign that the tests are providing very similar results. It means you're performing quite well. If you search for GMAT and Computer Adaptive Test Scoring, you'll find some great articles from our friends over at
Magoosh that might help clear up confusion.
Let us know if we can help with other qs.