No, the correct spelling is extracurricular. Adding extra does not require a hyphen. For example, extraterrestrial is extra+terrestrial (no hyphen needed).
Yes it should be hyphenated.
Yes, it should be hyphenated.
Yes it should be hyphenated.
yes check-up should be hyphenated
It should be hyphenated.
"Field" is not hyphenated.
Yes it should be hyphenated.
No it shouldn't be hyphenated.
Yes, "low-to-intermediate" should be hyphenated when used as a compound modifier before a noun.
Yes it should be hyphenated.
Yes it should be hyphenated.