I'm happy to help!
Here's a blog article about SC strategy ---
https://magoosh.com/gmat/2012/gmat-sente ... trategies/
You will find several more articles about SC on that free blog.
Here's a free video lesson ----
https://gmat.magoosh.com/lessons/600-gen ... strategies
We have a long series of videos about grammar needed on SC, as well as videos for all other GMAT questions.
Here's a practice SC question:
https://gmat.magoosh.com/questions/1095
When you submit your answer, the following page will have the complete video explanation. Each of our 800+ GMAT questions has its own video explanation.
I hope that helps. Let me know if you have any specific questions.
Mike
