Algebra I exercise difficulty

Hi all, 

I'm currently preparing for Math exam for college. I'm did not pay too much attention to math in high school for certain reasons but I do know the general rules for the most part. I just need tons of practice. I usually just watch Sal solve an example then I go and practice it. And I'm going through the examples without much of a trouble. However when I saw example problems from previous exams I did not know where to begin with. Most of the problems seem a level or two higher in difficulty then the examples here. 

These are the type of problems I will face and I'm not even touching the geometry and trigonometry parts:

Any suggestions?