Senior issue

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Across
  1. 5. "September 1st, 1989 [...] first day of senior year!"
  2. 8. "You.. got into Harvard law?" "What like it's hard?"
  3. 11. "O Captain, My Captain!"
  4. 12. Mike and Sully go to college
Down
  1. 1. T-Birds or Pink Ladies?
  2. 2. 80's teen comedy about a high schooler skipping school
  3. 3. Graduates create their own college to avoid discipline from their parents
  4. 4. College freshman join an acapella group
  5. 6. Girl with mommy issues changes her name to something quite unique
  6. 7. Graduates celebrate the last day of school in the 70's
  7. 9. The third installment of this Disney Channel classic shows our beloved characters finally graduating
  8. 10. These 3 iconic characters want to party and create an awful fake ID