Prof. Skilnik knows all big companies styles from GMAT Club posts. Those courses have good teachers and exercises, but they are focused on the 'average student'.
NO ONE would claim to have a better method or better tools for outstanding performances.
No! We start every exercise list with the basics, but we will include challenging ones in every one of them!
Besides that, our goal is to develop your quantitative maturity as the course goes on, therefore you should not be fearful!