On a balanced split, roughly 7 misses in Reading and Writing and 6 in Math, which is 725 per section. The harder Module 2 is required in both sections at this level, and the margin is narrow enough that individual careless errors carry measurable scaled cost.
Thirteen misses across the whole test sounds generous until you account for routing: the harder Module 2 is required in both sections, so the Module 1 errors that would cost you that routing are worth far more than their face value. Protect Module 1 accuracy before chasing hard-question drills.
The full picture, with the surrounding detail, is in Is 1450 a Good SAT Score? Above the Top-30 Median.