The Control Cost process is really important in the exam and by my experience you can find up to 5 questions related just with the EVM. The CAPM exam is not going really deep with the formulas but you should know them and be able to make some calculs.
Tip: if you are going for the computer based exam you will notice that there is a calculator on the bottom right corner of the page. My advice? Use it all the time! Calculs shouldnt be really complex but when you are under stress even 2+2 can be 5 if you dont pay attention!
Coming back to the EVM there are 4 basic formulas you should know:
Where AC is the actual cost, EV the earn value, and PV the planned value.
Tip: If you check the formulas once more you will realize something really helpful! They all start with EV the earn value and then is just about thinking if the formula is an index or a variance and what kind of (cost or schedule).
Now you know! Just remember this and for the exam you will be 4 question closer to your certification.
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