I have started to study for my MBA (part-time in the evenings after work?), and I am majoring in Management or Marketing. I am extremely busy this week, as I have a crazy amount of homework and preparation for class. This type of learning is more difficult (at a higher level) but it will help me. I do not study English because I can't handle (more) homework. Anyway, I believe in myself and accept the great challenge.

Don't start a sentence with "because" or "but".