Considering your situation and, apparently, the fact you completed Fr 3 in middle school, you really to complete Fr 4 in HS. If Fr 4H is too hard, drop down to Fr 4 regular and get a tutor.
(Try watching fun shows in French with subtitles, such as Call my agent and Lupin on Netflix, Art of crime on mhz/Prime, or Candice Renoir on Acorn. All fun, easy to follow, with good stories and typically French settings.)
Note that foreign language is a core class.
Colleges such as NYU would definitely expect level 4 if you completed level 3 in middle school.