what is the differences bewteen MKSAP2 and MSKAP12/13? one is one book and the other is few volumes! which is recomended for 3rd year when you say get MKSAP or you recommending both? Is one a question book and the volumes the info?
Your other clue is that when you look at MKSAP 2 questions you think, "Dayam, these are hard!" Whereas when you look at MKSAP 12 questions you probably think, "WTF???"