Concise rules: SAT loves keeping sentences shorter and structures simpler
Shorter and simpler language options are generally (exceptions follow) preferred in SAT grammar. Redundancy within a sentence and across the same paragraph must be deleted. "To-do" is generally considered simpler than "for/in doing". Active voices are also determined better than passive voices.
Here are some examples of concise rules.
1) Subordinating one term to another adds one more layer in structure, thus not optimal.
2) A phrase or clause in redundancy with another part of the sentence/paragraph
3) When it comes to forms of verbs, "to-do" is preferred over "doing"
4) Active voice is preferred over a passive one