High Quality CATs

Quant- Difficulty level of questions is high. Hence, practising them would be lead to a high score. Good segregation after tests topic wise. This helps to identify the weak sections and improve accordingly.
Verbal - The quality of questions is good. Explanations for correct answers are not satisfactory, especially for sentence correction.
Overall - Difficult tests compared to actual GMAT. Good analytics. Need further explanations for answer choices.

Guides are very informative. Exhaustive for Sentence correction. Quant basics are covered and only advanced topics are available in detail.
Most of the 700 - 800 level verbal questions are available in GMAT club and look repeated.