The ACT tests 5 subjects: English, Math, Science, Reading, and Writing. The last one is optional so you can choose not to write an essay if you don’t want to.
However, if you need to get as many points as you need to achieve your target score, working on this section will prove to be beneficial to you.
There are only a few specific topics that are included in the ACT. This makes it easier to prepare for since it limits the areas that you have to study for in order to be fully ready for the test.
For Math, expect to find Algebra, Geometry, and some Trigonometry questions. For Science, Biology, Physics, Chemistry, and Earth Science questions will come out. The English section, on the other hand, is more focused on grammar and style.