It's always too eraly early (this is just a typo) to say goodbye

I have finished my reading class today. bBefore i I stepped out of the classroom, Alice smiled to me and said "you may get 8 score if you try hard". "Thank you, I wil try my best" I replied. Actually, I just wanted to give her a hug at that the ("that" was okay, but "the" sounds better) time because that may be the last time to I see her. However, I just leave left (past tense) the classroom. afer saying that(this isn't wrong, but it's not necessary. Leaving off the end sounds a little more natural) . Of courese, I feel so regret for not hugging her now. Alice is my IETLS reading teacher. She has taught us reading skills for about approximately (again approximately is not wrong but saying "about" sounds more natural in this context.) for 1 month. This period During this time I ("this period" sounds incomplete. To say "during this time" expresses that something was happening throughout the entire time in question. Also, you need to add "I" to say who witnessed.) witnessed her devotion as well as my progress. She told us a lot, not only about (not necessary, but more natural) how to learn, but also her own exprience when studying in England. Sometimes she's so vigor and sometiomes rigid. (I'm not sure what you're trying to express here. Perhaps you mean "Sometimes she was very strict, and other times she was very relaxed"? I spent suah a pleased time along with her these days.(I think you mean to say "I really enjoyed the time I spent with her") It's do really upset me when I realised we may never see each other again. All in all, it's aways too early to say goodbye to someone you like.

All in all, not bad :) Many of the corrections were just to make the passage flow a little more naturally. The two sentences towards the end seem like you perhaps tried to express a Chinese thought in English. I do that all the time when I'm trying to translate into Chinese using American grammar or words. Correcting that is mostly just a matter of practice. 加油！