Best RHEL 7 exam prep book?

I made the mistake of getting the 6th edition jang prep book, and I noticed when the stuff it was talking about wasn't matching up with my Centos 7 install.

Whats the best prep book for the 7th edition of RHEL? Jang doesn't have one out and I don't want to wait...

Preferably one that has you do stuff more than just explaining over and over like Jang's.

Thanks. !!