2. Someone who is unable to attend school due to certain reasons over a long period of time and still considers him/herself in school while other's consider him/her a dropout.
3. Someone who has been absent from school for a while but is still registered and is being counted as a student of that school however, he/she tells everyone that he/she has dropped out.
4. Someone who has been treated unfairly by school staff and decides to take a leave from school for a while.
Person 2: "I'm an unofficial dropout. I might come back someday though."