Which MGMAT strategy guide to buy for their CATs

MBA
1

Since the gmat practice tests retail for 49$ online, and the strategy guides retail for about 1000 bucks online on amazon (a single guide includes access to all full length tests), it makes sense to buy one of their guides. Which one would you folks recommend? I am gravitating towards their RC or CR books

2

Since the gmat practice tests retail for 49$ online, and the strategy guides retail for about 1000 bucks online on amazon (a single guide includes access to all full length tests), it makes sense to buy one of their guides. Which one would you folks recommend? I am gravitating towards their RC or CR books