Bully

Story related, cannot be missed.

Story missions are depicted by the following yellow star icon on the map . You can also press to identify which missions are available to you. The below spoiler lists all missions available to you in Chapter 5:

Making a Mark
Cheating Time (side mission)
Rats in the Library
Gym is Burning
Finding Johnny Vincent
Townie’s Challenge (side mission)
Revenge on Mr Burton
Preppies Vandalised
Smash it up (side mission)
The Collector
Go See the Headmaster
Busting in Part 1
Busting in Part 2
Complete Mayhem