ACT and SAT Prep over the summer

<p>Yesterday I took the ACT, with no prep, I plan to prep over the summer. I have always been a slow reader, and today I had to guess on 20 question in the reading section, I read slow and feel pressured by rushing to read everything, and I end up not understanding the material. Should I be concerned, or is this something that can be fixed by a couple of months of prep over the summer and a ton of practice tests?</p>