e-GMAT

As an engineer, I was quite confident about quant. But, later realised that it isn’t that simple.
e-GMAT provided a complete refresher of all the concepts along with the various different types of examples
The Quant course offered by eGMAT is very comprehensive and goes into detail on every top that is tested on GMAT Quant. The quizzes and the multitude of questions at the end of each topic are very helpful in understanding how the concepts are tested.

the instructors are very prompt if you address any query. The general quizzes, the test scores are very apt to the GMAT score and to understand your score level and the loop holes while attempting the tests
I would definitely recommend e-GMAT's to everyone