It's just best to not attempt to do this from memory. You have to enter classes by each term. These days, most schools should have an unofficial transcript available to you online. AADSAS verifies your self-reported courses and grades against your official transcripts. If there are any discrepancies or omissions it can cause delays while it's straightened out. They say they will tell the schools, but that's probably if it looks like you're trying to really abuse the system.
It's basic info. But you want it to match EXACTLY what's on the transcript to avoid any issues.
Course Title
Course Prefix and Number
Course Level
Credits
Grade
Course Subject (classification: bio, chm, phy, eng, other-sci, non-sci)