I try to buy the Crack DAT PAT and there are actually several versions of (more questions with higher price) PAT and QR. I am wondering which version I should buy (of course it is good to have more questions to solve, but it is pretty expansive!). Also is it necessary to buy the QR one too? Anyone who used QR one, please give me some comments. and also where I can buy the Achiever? I know I can buy destroyer and crack DAT PAT through this site. Thanks!