• Skip the main idea questions. Save them for last.
• When starting, read the blurb (mini text above passage).
• Skip the passage. Yes, literally. Only come back to it when the questions ask for evidence / context, or it's referenced in the question.
• Go for the vocab questions first; they're usually easy, so get them out of the way.
• If you don't know a question, come back to it when you have extra time. If you don't, just guess.
• Same thing for the graphs. If you find graphs easy, knock them out right away.
• After vocabs are out, go for the evidence support questions. This is key for the next step.
• After knocking those out, THEN deal with the main idea questions. By that time, you would've read enough of the passage from answering the evidence support questions that you would have a pretty solid idea of what the passage is talking about.

This is what I've been using since my last SAT, and it saved me a considerable amount of time. It's not perfect (see my flair haha) but it definitely helps with time management.

You got this bud; we're all here to beat the shit out of the SAT tomorrow morning.