I don't think this is a secret. However, it is a valid strategy. Take a look at your ACT results the subcomponent scores. Analyze this score and determine your weakest areas. Go and purchase a ACT preparation book and focus on those weak areas. If you improve those subcomponent areas that you are most weakest then theoritically you should bring your scaled score up at least the 1 point that you will need.
See excerpt from following web page:
http://www.actstudent.org/scores/understand/index.html#relationship
How ACT figures the multiple-choice test scores and the Composite score
1. First we count the number of questions on each test that you answered correctly. We do not deduct any points for incorrect answers.
2. Then we convert your raw scores (number of correct answers) to "scale scores." Scale scores have the same meaning for all the different versions of the ACT offered on different test dates.
3. Your Composite score and each test score (English, Mathematics, Reading, Science) range from 1 (low) to 36 (high). The Composite Score is the average of your four test scores, rounded to the nearest whole number.
4. We compute your seven subscores (Usage/Mechanics, Rhetorical Skills, etc.) in the same way, but subscores range from 1 (low) to 18 (high). There is no direct, arithmetic relationship between subscores and test score—this means your subscores usually won't add up to your test score.
Relationship between the tests, questions, and subscores
Test No. of Questions Subscore(s)
English Test 75 Usage/Mechanics (40 questions)
Rhetorical Skills (35 questions)
Mathematics Test 60 Pre-Algebra/Elementary
Algebra (24 questions)
Intermediate Algebra
/Coordinate Geometry (18 ques.)
Plane Geometry/
Trigonometry based (18 ques)
Reading Test 40 Social Studies/Sciences
reading skills (20 soc. studies &
natural sciences questions)
Arts/Literature reading skills (20
prose fiction & humanities ques)
Science Test 40 None: the total test score is
based on all 40 questions.
The above should give you information to decipher which two areas are your weak area. Work on these areas in particular - placing emphasis on strengthening it. In doing so you should increase your score (by at least 2) provided you do not lag in other areas.