Since you're interested in improving your English, I'll help you as much as I can.
I studies about liberial arts in Sripatum University.
--- "study" or "studied", you don't add "s" to verbs when you use with "I".
My english is knows by little but I can do the exam so good.
--- "My English skill is poor"
--- "I can get good marks on exam"....Seriously? What kind of exam did you took? Based on what I read here, I have doubts.
I thinks mr.Nighty แมวสีฟ้า who has know about english so mush
--- again, you don't add "s" to verbs when you use with "I"
--- know (verb), you don't use has with verb. It's "knowledge" (noun)
--- "mush" does not exist in dictionary. It's "much"
--- It's "who has so much knowledge about English"
--- It's "Let's have" fun
It not a joke.Just basic form me.
--- form = รูปร่าง, from = จาก
--- You need to learn basic before teaching others about basic
มีคนไม่เก่งเลย ก็ Not serious,because it not difficault and not easy.So I think you can lern form your interesting education.
--- "learn from"
--- "you can learn from your interesting education", this sentence does not make any sense. I cannot tell what you're trying to say here. 1) "You can learn if you're interested in education"? 2) "You can learn from media that you're interested in"?
You ought(อาจจะ) comment more than one cause misstake.
--- ought to = ควรจะ, might = อาจจะ
--- more than one cause "mistake", I don't get what you're trying to say here.
My gramma was yet bad.Someone can help me for true things.
--- "My grammar is still poor/bad" is better.
As for what สรรค์ is trying to tell you, it's "Grammar Nazi", a popular meme/joke on websites like 9gag
Anyway, brush up your vocabularies and basics for grammars.
My English is not perfect too, so I won't expect anyone to be perfect. But from what you showed here, it's still a "Tinglish" (Slang for Thai+English), cannot be called as "English" yet.
Keep practicing, you still have long way to go.