This is completely false, because the ACT Science section has absolutely nothing to do with science as it is taught in high school. In fact, you really don't need any background in science as everything needed to answer the questions is included in the experiments. I've had many students that either hate students or are very weak in science get very high scores on the ACT science section. There are usually 7 passages (experiments) in each ACT Science section and each experiment usually contains 2-3 graphs/charts. The main skill is basically analyzing charts and graphs. I would recommend practicing the science section using the following 3 rules:
Rule #1: Don't waste your time reading the experiment and go straight to the first question. Read the question and then read the answer choices to help you determine what part of the experiment (which chart or graph) you need to focus on.
Rule #2: Go to the appropriate chart/graph or portion of text in the experiment and narrow down the answer choices until you're left with the right one.
Rule #3: Remember that you only have about a minute per problem, so if you're stuck on a question (and its been over a minute), just take your best guess (based on what you've narrowed down) and move on. Remember that there is no guessing penalty on the ACT and if you spend an extra 2-3 minutes on a problem, that's 2-3 questions that you're probably not going to be able to get to on the exam.
Hope that helps!