Your ACT composite is the average of English, Math and Reading, rounded to the nearest whole number. Science is reported separately and does not enter it.
Averages have a property that most students never act on: every section contributes equally, so the cheapest point is always in the weakest one.
The arithmetic
Take a student sitting at English 31, Math 24, Reading 30. Composite: (31 + 24 + 30) ÷ 3 = 28.3, so 28.
Two options for where to spend eight weeks.
Push the strong section. English 31 → 33 is genuinely hard at that level. New composite: (33 + 24 + 30) ÷ 3 = 29.0, so 29. One point.
Push the weak section. Math 24 → 28 is a much more ordinary gain, because the content gaps are larger and more findable. New composite: (31 + 28 + 30) ÷ 3 = 29.7, so 30. Two points.
Same effort. Twice the return, and the second one was the easier piece of work.
Why students do the opposite
Practicing your best section feels good. You get most of them right, it is pleasant, and it looks like productive work. Practicing your worst section is uncomfortable in exactly the way that improvement requires.
There is also a reasonable-sounding argument for the wrong strategy: "I am close to a 34 in English, I should push it over." Closeness is not the same as cheapness. The last two points of any section are the most expensive ones on the test.
What to do instead
- Get all four section scores from one full-length timed test. Not a guess, not a memory of last time.
- Rank them. Your lowest is your project for the next block.
- Diagnose within it. A 24 in Math is not a uniform 24: it is usually strong algebra and weak trigonometry, or fine content and bad pacing. Find out which before you study.
- Protect the others. One timed section a week each is enough to keep them warm.
Where Science fits
Science is optional and outside the composite, so it is never the answer to "how do I raise my composite". But it is worth knowing that it is the section nobody trains, which makes it unusually improvable if you want a STEM score, and the method transfers directly to ACT Math data questions.
The rounding edge
Because the composite rounds, some students sit fractions of a point from the next number. (30 + 30 + 29) ÷ 3 = 29.67, which rounds to 30. One extra correct answer in the right place can be worth a whole composite point, and it is worth checking whether you are on such an edge before deciding a section is "done".