Horrible Test Taker! Help!

Okay so I have been studying for the OAT for three months (between work and classes) using Chad's videos. But my practice scores have horrible!

Kaplan free online test:
Bio 320
Chem 260
Org 240
Phys 280
Read 280
Quant 380
TS 260
AA 290

Gold Standard free online test: (which seems a lot harder than it should be)
Bio 290
Chem 320
Org 250
Phys 200
Read 350
Quant 330
TS 250
AA 290

ADA free sample test: (Just took this today)
Bio 310
Chem 320
Org 330
Phys 320
Read 360
Quant 350
TS 330
AA 330
But...

Horrible Test Taker! Help!