OAT achiever vs Topscore

[iammc]

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my test is in three weeks and i have destroyer & kaplan books but i want to work on my timing more i have 3 full exams from kaplan and practice test and looking to buy oat achiever or topscore.
i searched little bit and most recent one is three years ago!
i am wondering which one will be better pratice?
please advise
thank you!

 

[Doremon]

Get both if you can, but Achiever tends to prepare you for the worst of the OAT.

 

[OptomHope]

I can't say anything about TopScore but the Achiever scared me into doing well on the OAT haha. what i mean by this is that Achiever is very challenging and forces you to study harder and learn more. My AA for the Achiever were around 320 but i actually got 350 on the real OAT.