S&D works for factual questions, but there are much less of them than are on TopScore.
Best thing to do is go through the questions...find a keyword from each of them that are factual and put it in the back of your head. Any that are obviously tone questions or inference questions, just write down your paper that #X is a tone/inference question, and skip them until the end.
Read (fast) through the passage, and each time you come to a keyword you remembered, find that question and answer it, then keep going until you read through the entire passage...then look at the ones you still havent answered, and again skip the tone/inference questions, and find the questions that are factual/have a keyword, and go through the passage quicker this time and find them. After this you should be probably done with the factual questions, now go on to the inference/tone questions, they usually involve like a concluding sentence at the end, or the tone of a paragraph...so either go to the last paragraph and read it for a concluding sentence, or find the paragraph it's talking about, and read the whole thing and figure it out.
This is very similar to VicViper's strategy, and it worked well for me, was expecting higher than a 21 on my test, but this strategy can eat up time if you read too in depth and don't speed read (a little slower than skimming)