Your ACT score composite is a statistic. The truth lies in your individual ACT scores. What was your English score? Reading? Science? Math? Writing? Each one gauges a different competency. The way to increase your ACT score composite is to look at your individual ACT scores and see where you need to improve the number. Did you notice that both reading and science have the same amount of questions and the same time limit? Did you notice that English offers you the shortest time to answer the most questions? What do you really need to know to score well in math? Why does this test require a speed driven essay, when you have always been taught to write thoughtfully and edit thoroughly? If you can answer these questions then your ACT score composite will be the number you want it to be.