<p>Ds just took a practice PSAT and scored really well, tantalizingly close to NMSF cutoff even with a four-point jump this year. His lowest section, in the 600s, is writing. Any resource for quickie grammar tips? He missed three of the questions where you rewrite part of the sentence and two of the questions with the various underlined sections, so he does great, but each point will count for him. TIA.</p>