I found the major issue to be the time pressure and not actually the difficulty of the questions. I would suggest that you do the practice test questions online and read anything you can find about it on the ACT website.

The section that I found the most time pressured was he reading section. There are 3 rather long paragraphs with questions to each. You only get 20 min for 30 questions and then you also have to read all the texts…. I would suggest that you practice reading quickly and precicely!

The science section is not very challenging because you are given all the information and you just need to be able to interpret/understand it. Here again there is a major time issue though! What i would do is read the questions frist AND THEN go back and read all the information and just read the part that gives you the needed answer.

But over all I would just say.. relax during the test and do the best you can do! GOOD LUCK!!!