I took the Princeton Review course to prepare for the OAT and the dignostic tests they gave us bi-weekly were harder than the actual OAT. It helped because I kept getting below 300 on the diags but I got a 340 on the actual test. It also helped because they tried to put us through the actual OAT experience. They wouldn't let us talk or ask questions while we took the practice test. They also went in the same order with the same breaks. I'd give you my diags, but I gave them to one of my pre-dental friends. SORRY!! 🙁 Good luck though. STUDY HARD.