It is not TAMMAM but tamām!
That seems to be how it's written in the question (تمام). Are you objecting to the pronunciation?
Yes, it is pronunced like tammam while it must be tamam
translating tamaam with ok is a choice, many people would find ok much too colloquial.
Yes. Should "fine" be acceptable?
Is "Everything alright." too colloquial or why it is marked wrong? Is "Everything is alright." acceptable?