Everyone acts as if they are good.
is it correct ? does "they" means "Everyone" here?
Yes, it's correct. "they" refers back to "Everyone" in your sentence. Note that, in English, when the gender of the subject is unknown, "they" is often used instead of "he/she".
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I forgot to tell you two important things. First, in the subject box, you've written "grammer", which is not a word. It should be "grammar". Second, please don't put a space between a question mark and the word that comes before it. Please look at the following sentences:
1. Is it correct ? does "they" mean "Everyone" here?
2. Is it correct? does "they" mean "Everyone" here?