What should I do in these situations?

Studying tips

1. The course has just started. I have to start studying but I can't concentrate. 
2. My History exam is in two weeks. I can't memorise everything, I have to study about 5 units. 
3. I study hard every day, from 4 p.m to 9 p.m., however I always have a feeling "I am going to fail"
4. Every time I study Chemistry I have to face words that I don't understand.
5. I am always tired. I have to study long hours. 
6. I can't concentrate at home. My husband is a lawyer and he is always answering his mobile phone. My child is 6 and he is always asking me for help.