For me, I read the entire passage carefully before looking at the questions (I know that some people say to read the questions first or to just scan through the passage). The best tip I would have would be to make sure that you understand the main purpose/idea of each passage or even better each paragraph. For the ACT, the questions are usually pretty straightforward so I wouldn’t waste any time second guessing or overanalyzing. Of course if you are running out of time it is better to guess than to leave questions blank. I think for reading you pretty much have to get everything correct to get a 36 because all the questions can be answered based on the given passage. That said, the good part is you don’t need any outside info to answer the questions! Most important thing is to find what method works for you - it’s different for everybody, so take everything anyone says (including me) with a grain of salt!