For most GMAT test takers, many tend to score lower on the verbal section than the quant section. This is true whether you are a native english speaker or an international student.
I understand that you've tried multiple times already and tried various methods with little success. However, this is not the time to give up.
What you need right now is an Action Plan:
1) Use a Diagnostic software and identify your weakness in verbal section.
MGMAT CAT exam does this. It tells you the type of questions you are weak, and also the score level. (i.e. - 500 to 600, or 600 to 700) If I remember correctly, you get about 6 CAT exams free with any
MGMAT guide purchase.
2) Once the weaknesses are identified,
MGMAT guides have specific problems and page numbers by question type in their guides. Practice these questions on
OG.
3) Forget the time management issues for now. Do these problems and compare your answer/reasoning for choosing your answer vs the
OG answer/explanation. MAKE SURE THESE TWO MATCH! Otherwise, you are wasting your time.
4) If your verbal score is low to begin with, then forget about thinking, "If I do difficult problems only, then my score will go up."
This is not true. CAT exams won't even show you difficult questions unless you get the easier level questions correct consistently.
5) Maintain an
error log so you can revisit the incorrectly answered questions later.
6) Don't take another CAT exams until you repeat the above steps multiple times.There is no point in practicing with CAT exams, unless you account for your weaknesses.