I heard trying to move your mouse over the words while reading them helps because you are more concentrated on reading and not finding your place, and you are less likely to just glance over things.
Also, I know many people say to just read the questions and then answer them, but I find that jotting down key words from the question and then reading through the passage and being more alert during those parts helps. This also might work for more broad questions because you spend less time searching for phrases or points because you have a general idea as to where that concept was talked about.
A mistake that I have been making is not thoroughly reading all the answer choices and instead, I would pick the first one I thought was right. This might seem like common sense, but maybe it could help you too 🙂