These are my scores from Achiever I for those sections
Bio/GC/OC/RC
Achiever I: 17/16/16/15
DAT (6/6): 23/19/21/23
Don't be discouraged. RC on achiever is the only thing I had to prep for RC and I was scared out of my mind! I took achiever 1-3 for RC and made sure I could get through all 3 passages in the time (That didn't happen my first time on achiever I.. and i think achiever 2 i got a 14 in RC ). The RC questions on the DAT seemed to have much less inference questions and more straight facts from the passage. I found the actual DAT reading section to be MUCH easier. Don't worry, keep practicing and you will be fine 🙂