Kap math workout (Vs) Kap 800

[Cute]

Please suggest me if i can buy Kaplan math workout when i have the kap 2005 with CD and Kap 800. Are there repetitions.

1. Kap issue
2. Whether Manhattan GMAT math tough questions for 75$ is worth buying.

Thanks in advance.

[reactor]

You don't need the Kap math workout. Good luck! (I don't know about 2)