Chances?

So I'm a senior in high school and I've taken the ACT once and made a 24 without studying. My scores were 28 reading, 22 in science, 23 in math, and 23 in english. I need a 26 to get Zell Miller scholarship (pays full tuition in Georgia) I have the HOPE scholarship rn which only pays 80% tuition but it would be ideal to have it completely covered. Do you think if I prepare this time I could boost my score up two more points. I would be disappointed in myself if I atleast didn't try. What is the likelihood? I'm asking ppl who took the ACT more than once. much appreciated . and what are some good ways to prep for it?