It really depends. I dont think you can say for certain. Most would agree Top Score and Achiever are harder than the real thing, but I really think it depends on the questions you get wrong. For instance, Top Score biology is filled with Plants and Taxonomy type questions, and I dont think you will see more than a few questions on those. Also, Achiever and Topscore go way overboard with calculations on Gchem.
Basically, dont worry too much about your scores. Learn from your mistakes by reviewing the questions you got wrong, and use the practice test to guage your weak areas.