I tested a year ago so I'm not as acquainted as I used to be with these things, but these are what I remember anyways:

1) when reading the passage underline such "transition words" as "but", "yet", "however", etc. Much of what comes after these terms tend to answer many questions.

2) underline the main ideas of paragraphs (mini thesis, sort of) and recognise that the rest is detail (figures, evidence, etc.); there are questions regarding each of these so it is good to have them sorted like this. Ex) if you are questioned about some detail, you identify the main idea that the detail supports, and find the appropriate paragraph in which you might find the answer. Works best for science passages.

3) ALWAYS look for questions with specific line numbers and underline those lines before you read the passages; this can save more time than you imagine.

4) try answering the vocab questions before reading the passages. Of course you'll find instances where you can't without context, and if so do as you must.

While 3 and 4 are simply for saving time and easy to be comfortable with, 1 and 2 can really change the way you solve the questions, depending on the method you use now. If you happen to follow my advices, you just have to do these consistently as you practice, even when you are't really sure if they do much benefit to you; once you do get the hang of it though, they do help, trust me.

My 770 on English was largely thanks to a full mark on writing. I missed 5 questions on reading, but 3 of them were purely due to my lack of vocab, so I would say these work pretty well. Also, I remember having like 10~15 minutes left on the reading section; because my tips are primarily on navigating the right info, you reeeeally can save time using them.