iam just worry about reading
Personally, I didn't find top score's science portions that similar to the real thing; however, lots of people on this forum say that it's a pretty accurate match to the real thing, score wise. What are you aiming to score? Because if you're aiming for around 19's across the board, then you seem ready. If you want to crack the 20's, then you should prepare more. Especially with chemistry because there are only limited number of types of questions the DAT can ask, so you should do lots of practice problems and master those.