How to Detect No Error Sentences SAT Writing?

I want to score close to an 800 on SAT Writing, but I keep thinking there's an error in every sentence correction question. I always end up getting 5-10 questions wrong because I can never bring myself to choose "NO ERROR" as the right answer. How can I do a better job of detecting sentences where "NO ERROR" is the correct choice?

Keep practicing sentence correction questions, and memorize the grammar rules that come up on the SAT (http://blog.prepscholar.com/the-complete-guide-to-sat-grammar-rules). If you know the rules very well, you'll be able to go through each choice and confirm beyond a shadow of a doubt that "NO ERROR" is the correct answer. If you're just going by what "sounds right" without referencing any concrete rules, it's easy to second-guess yourself and see errors that aren't there.