This table shows the number of correct answers required to earn a specific ACT score. For example, to get a score of 30 on the math test you must get 50 or 51 of the 60 questions correct.
It is hard to improve from a 19 to a 26 because you have to improve your raw score from 27/60 to 40/60. So, a 7 point ACT score improvement can require 13 more correct answers, which would be approximately a 50% improvement on the previous score! Because it is so hard to improve your score, make sure you do LOTS of practice and get some tutoring.