Since of course you’re doing the College Board QOTD every day, you should focus on learning as much as you can from doing those questions. Prepping for the SAT is not just about learning rules and facts, but it’s also about learning what the SAT likes and what the SAT tests. Knowing what the SAT will test most frequently will give you an edge and make you more efficient on the test.
The Question of the Day from June 14th, 2013 was a great example of a common rule the SAT loves to test: modifiers! If you understand modifier rules, you’ll easily be able to pick up 4 – 8 questions every test, and that could translate to 80 more points for your Writing score.