Reflection of English class

My reason for studying English is to improve my English skills in order to get a high score in IELTS and to go to university. During the last term, English class was okay. I could not understand everything because the teacher and classmates spoke so fast but it was still fun.

I am not sure the differences or similarities between academic English and general English. I know some words are formal and some are informal but it is not clear for me.