Hi so I got my test scores back yesterday from taking it for the first time. I did horrible in reading because I hate reading and I read very slow (25), but I did ok in science (31). For reading, During the test I didn’t have my glasses, so I think I spent a good 2 minutes (throughout the WHOLE test. Not just the reading) squinting to look at the clock. I looked at the wrong hand and thought we only had 2 minutes left, but we had about 10-15. 
So I guessed on 2 whole passages, and realized that I had a lot more time. At that point I was just freaking out and couldn’t pay attention to the rest of the passages. So I can’t help you with the reading part.
For science, I went straight to the answers and started solving right away. ALWAYS do the passages with graphs and/or tables FIRST!!! In those passages, go to the table/graph and mark down the relationship between the items listed.
Ex: In a table, If the temperature is increasing (top to bottom. 0,20,40,60,80,etc.) then mark it with an arrow pointing up (to represent an increase). If another variable is decreasing, draw a downward facing arrow. If there’s not a consistent increase or decrease, don’t mark it.
In a graph, look at the relationship between the two lines. You’re pretty good at math, so you’ll know if it’s a direct or inverse graph, or if it’s a linear or exponential. Mark it down on paper even tho you know it in your head! It’ll be easy to just glance at and quickly answer questions. Don’t read the passages until you come to a question that is necessary to read the passage!!! You’ll just waste time! The first 4 are usually very easy, and the last are difficult. You said that you do well on CV, but how lon do you aoend on it? Make sure to not waste a lot of time with it!
You can go in the order you want, but I’m just letting you know what worked for me! On a practice test I took 3 months ago (without studying) I got a 24. After about a month (2 weeks in april and 2 weeks in June) I raised it to 31! That’s 7 points! You don’t need to raise it that much though… I just watched a ton of videos and got ACT books! I reccommend Princeton Review and the actual ACT prep book! I mainly used the Princeton Review though:) Thanks! Good Luck and I hope this helped!!!