You can take those three tests as many times as you want. You'll just have to reset/change the scoring. I'm sure you've figured this out already, but you can also just take subsections instead of taking the entire test. The results option is very helpful as well because it will show you which subjects you need to improve on under each science section. Really, I just used Topscore to work on timing. There are some good questions but I found the real DAT to be a little bit harder. Just my opinion though..Good luck!
