I ran through questions from QR in the destroyer twice and went to math destroyer second. I thought of it as math destroyer has 600 questions while QR section of destroyer has about 150ish; Dr. Romano probably sells more DAT destroyer than Math Destroyer, and I assumed that he would have a succinct variety of question types contained in DAT Destroyer (i.e. he's not gonna mess around) while Math destroyer at times, for example, goes crazy with probability and statistics on a test (i.e. he has freedom to mess around on some questions)
*cough* look at test 12 *cough*