My routine studies

So... It is the first time that I write here and I am going to talk about my day. I'm on vacation of college and I have been trying to improve my english to travel and study abroad. Today I studied grammar, all tenses such as present perfect and past perfect, but I found it a little difficult to understand but here I am trying to use, if it is correct I don't now. haha

Well, I tried to correct what I thought was wrong. As a Portuguese speaker I can understand the sense of the sentence "I'm on vacation of college" but I'm not sure if English speakers would get it. That's all, bye!