I am new to this site and new to HVAC. I am a student at local communiity college taken HVAC course. I thought I understood material until I got home and drew a blank. I am hoping someone can help me understand how to use certain formulas for calculating. EX.

Given: R-22
evap. outlet superheat = 10 f
evap. outlet temp. = 50 f
cond. pressure = 246.1 psig

Find: evap saturation temp. =
evap pressure =
condensing temp. =
amb.temp. =
if subcooling = 12 f, the cond. outlet temp. =

This is my second day of class. The biggest problem is trying to digest 7hrs of class information. I have to deal with it until Nov; I will never take such a long class again,it's too much but I will succeed. Can someone help me understand this proplem?