Did I overload myself??

Hey everyone, just wanted to get some opinions and feedback. Haven’t been in college since I was 18 to about 20 (I am almost 40). Currently working part time (20 hours) and a single mom of 2 kids (9 and 14). I am enrolled in a Math class, English Composition class and an Anatomy and Physiology class. I feel like between my English and A&P class, I can’t seem to stay ahead and retain the material for my A&P class. So much reading and material for English and A&P and feel as though I can’t keep up, should I drop a class to focus on one? Feel like I am already spending any extra free time “studying” and reading through stuff I don’t always understand. It’s stressful lol