Pi/Po tests is for testing your DVD media burns
c1/c2 is like Pi/po, except for testing your CD media burns
fe/te test basically tests the media inserted to see if it can written at the maximum speed the drive says it can be written at. It will tell you if it can be written at the max or if you need to lower the burn speed
TA basically represents jitter and phase shift in peaks from the burn. It will run about 15 seconds for each of the 3 zones (for single layer media) and give you a score for each zone, telling you if it's 'excellent,' 'very good,' 'good,' etc. Your PDF manual will have more detailed explanations on them.