Hey there! I took Chemistry, Anatomy 1 with Lab, and College Algebra all at the same time and managed to get an A in all of them. I do not have a job or children. Time management is the biggest thing. You have to know how to manage your time. You cannot be on your phone texting and being on social media all the time. You have to learn how to say "no" to people sometimes. I'm not saying you should be studying 24/7, but you need to devote a lot of time to your studies.
Also, find out how you learn best. Flashcards was perfect for me for Anatomy 1 Lab, but the the lecture, there was too much information, so I found using flashcards was pointless. For Anatomy lecture, I would record my professor while he was lecturing (with his permission), and then I would listen to it after school and fill in my notes with any information that I missed.
It all comes down to how you manage your time and your work ethic.