Congratulations on your score, and thank you for all of the valuable information. I have been using the ATI Smart Prep and have consistently scored 85-89% in all subjects. I have taken AP and Micro, so I am sure that helps. My question is: If I think I may run out of time, is it better to guess and answer them all, or not answer them if I run out of time. I tend to get nervous when I see the clock winding down. I have been taking the units timed, but I am trying to prepare for all scenarios. Also, can you use a calculator. I have heard some people say yes, others say no. Thanks again for your information!