I bought both these book. They both seem to serve the exact same purpose, i.e., both supplement MGMAT SC
Which one do you recommend me to review? In other words, which between the two of these is a better supplement for MGMAT RC
ps. what is the correct usage: "X is a supplement to Y" or "X is a supplement for Y"? (my guess is "for") I know that the perfect usage is "X supplements Y", but I want to understand what is the right idiomatic usage of supplement as a noun.