Scored 660 in SAT Reading & Writing what are the best resources for improving reading

I recently scored 660 in SAT Reading & Writing, and I’m mainly struggling with the reading/text-based questions, particularly the questions around 5–15.

My biggest issue is time. I often understand the passage and the question, but I take too long to reach the answer. I also make an occasional grammar or vocabulary mistake, but I’m mainly trying to improve my performance on the reading questions so I can get a much higher score.

I’m looking for recommendations specifically for SAT Reading & Writing reading practice, rather than grammar.

What are the best YouTube channels, videos, websites, books, question banks, or other resources for improving at these questions?

Also, what helped you most with increasing speed without sacrificing accuracy? Was it mainly doing lots of practice questions, learning a particular approach, timing yourself in a certain way, or something else?

I’m aiming for a very high Reading & Writing score, so I’d like resources that can take me from around 660 to 750+/780.

Would especially appreciate recommendations from people who have significantly improved their score.