Reasonable goal

<p>Hey guys,
I took the ACT this month without any preparation, and I felt like failed the test after taking it. So, I got a 28 composite score, which isn't that bad. If I were to get a tutor or take a class and study really hard for the next couple months, what would a reasonable goal be for the ACT in April? How much do scores usually jump after taking a course or working with a tutor? Thanks</p>