My morning.

I woke up at about 5:30 am this morning, it was earlier than normal. I supposed maybe because I will have my first German lesson in my university this afernoon. I got up around 6:00 am. Then I had a cup of coffee and began to preview <Themen Aktuell> (my German textbook). I hope I will have a good beginning in learning German.

First of all, I fixed a few places where spacing was off between characters. Your first sentence can actually be 2 sentences, or require a different way of linking them than a comma. I woke up at about 5:30 am this morning. It was earlier than normal. I believe this is the simplest way to correct it, but there are other correct options too. Both are full complete thoughts and can stand on their own in a sentence. I supposed this is because I will have my first German lesson in my university this afernoon. OR Maybe this is because I will have my first German lesson in my university this afernoon.Using both "I suppose" and "maybe" is a little repetitive, and you need a verb such as "is" before the word "because" to make it a correct sentence. These were the biggest things to correct. The only other thing is that I would use the words "start to" instead of "beginning in" in the last sentence as this sounds a little more natural in English.

Overall, really good job! Please let me know if you have any questions!