Manhattan vs PowerPrep discrepancies are puzzling

[makingmoves]

After taking the PowerPrep Practice Exam 2 after steady improvement shown from Manhattan Tests over 2 months, I received a lower score as I did on the first PowerPrep practice...

 

Scores:

 

ETS power prep 1    156V, 154Q

Manhattan Test 1    161V, 148Q

Manhattan Test 2    163V, 152Q

Manhattan Test 3   157V, 153Q

Manhattan Test 4   158V, 155Q

Manhattan Test 5   158V, 157Q

Manhattan Test 6   158V, 164Q

ETS power prep 2    156V, 150Q

 

This is what is confusing me. Looking strictly at Quant:

 

For the last test I took, ETS Power Prep 2, I got 14/20 correct in section 1, and 11/20 correct in section 2.

Yet, for ETS 1, I got the same, 14/20 correct in section 1, and only 10/20 correct in section 2.

 

BUT, I got a 154 on ETS 1, and a 150 on ETS 2...

 

Moreover, For Manhattan 5, I got 10/20 correct in section 1, and 10/10 correct in section 2...

Yet I got a 157...

 

How is it that I got more correct in the first and second section on ETS Power Prep 2, yet got a Quant score of 150... 4 points below the Power Prep 1, and 7 points below the Manhattan 5.

 

See chart below (it's a picture):

 

 

Edited November 13, 2013 by DTurcotte2013

[C_Chattra]

I have the same question about Manhattan vs. PowerPrep score. I'm taking the test tomorrow and will let you know which practice test align more with my real score.

[makingmoves]

Okay Chattra, good luck! Let me know how you do!

[makingmoves]

Any more thoughts on this?