Walkthrough - Summertime Saga Wiki more specifically
1) Ms. Dewitt’s route - Summertime Saga Wiki
2) Jenny’s route - Summertime Saga Wiki
3) Main story: Part 1 - Summertime Saga Wiki
4) If you mean the dress code involving hair dye then Eve’s route - Summertime Saga Wiki you only need to ask Coach Bridget about the dress code.