Yes, they are, even if your major majors are not science subjects. There are 2 reasons for this. Firstly, they contribute to your overall composite score, so they cannot be ignored. Secondly, science tests are designed to enable an evaluation of the students’ analytical skills, which are required in even non-science subjects. Not being able to do well in ACT science tests does not mean that a student will not score well, but it becomes much harder.
A tuition organization that specializes in online ACT prep services will be able to not only answer all your questions but will also be able to guide you and provide you with the learning resources to maximize your scores.