I am in the same boat. I have 2 boys, work full time, and try to squeeze in study time. By time I make it to study I am exhausted. When I first started, I would try to study during my breaks at work. Believe it or not, I was making A's. Now that I have attempted study time at home, I am not grasping the information as quickly and I made a C on my exam.
So, I definitely feel where you are coming from. Looking for the same advice here.