Differences between LOS and Practice problems.

First of all I want to sorry for my English  
When I was going through the Curriculum I found that some subjects which are not required in LOS are actually examined after in practice problems section. I thought that when they dont say in LOS "compute or calculate" then you dont have to know how to count it.  Or maybe practice problems are not real questions from the exam? 

So do I have to learn all of the formulas? 

Thank you in advance,
Marcin