Sentence Correction

Hello there,

I'm currently doing the EmpowerGMAT course, and while I think the quant section is fantastic my sentence correction score went down after implementing their tactics. It could be that I just need more practice of doing it their way. I'm only about 40% done with the course and just got done taking my CAT 3. I've added my test scores below, and all are from the GMATPrep software. My target goal is 650, which I think I can get, but my sentence correction score is horrendous. If you have any advice please share!

Exam 1 (9/17/2017) - 520 (Q33 & V28)
Quant Section
PS - 30 (22%)
DS - 37 (38%)
Arithmetic - 36 (35%)
Algebra/Geometry - 31 (24%)

Verbal Section
CR - 32 (61%)
RC - 37 (78%)
SC - 17 (17%)

Exam 2 (10/09/2017) - 570 (Q36 & V31)
Quant Section
PS - 36 (36%)
DS - 38 (40%)
Arithmetic - 38 (40%)
Algebra/Geometry - 36 (36%)

Verbal Section
CR - 38 (78%)
RC - 34 (68%)
SC - 20 (24%)

Exam 3 (10/25/2017) - 580 (Q38 & V32)
Quant Section
PS - 34 (31%)
DS - 47 (65%)
Arithmetic - 32 (26%)
Algebra/Geometry - 48 (72%)

Verbal Section
CR - 51 (98%)
RC - 34 (68%)
SC - 6 (0%)