4 High Value SAT Grammar Rules That Raise Your Score The digital SAT rewards a small, mechanical set of rules more than raw talent, and Wonprep sees the same four categories drive most point swings: commas, semicolons and colons, subject-verb agreement, and transitions. Master those first. Run a 20-second checklist on every Standard English Conventions question, and start today with a five-minute timed comma drill before moving to anything else. TL;DR: Most SAT grammar errors stem from confusion around commas, punctuation, and subject-verb agreement, making targeted drills in these areas highly effective. Understanding punctuation rules like semicolons and colons through quick “period swap” or completeness tests improves accuracy and time management. Finding the core clause by ignoring modifiers simplifies boundary questions, helping to identify fragments, run-ons, and comma splices with ease. Cross-out techniques for agreement and pronoun case questions quickly reveal grammatical mistakes and prevent common trap answers. A personalized diagnostic approach ensures study focuses on the rule categories that most impact individual performance, increasing efficiency and score gains. Wo