Well, this is good to start with. Since you mention you are non native, a similar situation with SC is what I faced myself, and after careful consideration opted for
EGmat course. have solid concepts covered on line in their verbal live prep at a minimal cost. However, since I dont know which books you referred till now, my advise might exactly strike the chord. I used
MGMAT along with
EGMat and it has helped me. Now you need to look at which course you already took and then find a course which does not teach extreme variations in approaches specifically SC. I know many courses - some focus on grammar, some on splits and some on meaning (
Egmat), and it depends which one you want.
But ensure, the new course does not clash your previous course. But since you mention 4-5 months, my personal opinion will be
Egmat for Verbal for non natives is far suited. While Gmat pill is definitely good, but when I did my research, as a non native, I could not relate to their approach much relevantly.
So introspection will be key here, since forum reviews are very generic and not specified to each one of us.
Hope this helps