what's better oat achiever or oat professor?

[itek2OD]

I've reviewed each test helper and other than professor being online and the achiever on my computer, they're the same. i might just use both.
any ideas? i'd say physics is my weakest subject - but i'm taking it this summer, so i'll have lots of incentive.

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[NeverGiveUp]

I've never used the professor, but oat achiever has definitely been a great tool for my second attempted OAT.