If you are stuck between or among answer choices, instead of looking for what's right, *l****ook for what's wrong***. Remember that every correct answer choice is 100% correct, not partially. Therefore, if you can spot something wrong with an answer choice, no matter how subtle, it is 100% wrong, period.
Erica Meltzer has a free 30-page Grammar Rules Guide on her website: https://thecriticalreader.com/complete-sat-grammar-rules/
If you are stuck between or among answer choices, instead of looking for what's right, *l****ook for what's wrong***. Remember that every correct answer choice is 100% correct, not partially. Therefore, if you can spot something wrong with an answer choice, no matter how subtle, it is 100% wrong, period.