Yeah, there is a $25 review book with over 100 practice problems and solutions on Amazon that I will be going over this week. I also really need to study some topics like statistics so I may look into getting some review booklets about that topic.
Check this review book out: https://www.amazon.com/Environmental-Engineering-Preparation-Questions-Solutions/dp/1532827237/ref=sr_1_2?s=books&ie=UTF8&qid=1480357826&sr=1-2&keywords=environmental+engineering+fe
I found it on another post from this sub and it has good reviews. For $25 it can't hurt.