Prep School

Prep School is a quest in Fallout 4.

Quick walkthrough

 * 1) Head to East Boston Preparatory School (located due east of Bunker Hill).
 * 2) Clear the building of raiders, working your way up to the top floor.
 * 3) Kill Zeller.
 * 4) Release caravan prisoners.
 * 5) Report back to Kessler in Bunker Hill.

Detailed walkthrough
Kessler is looking for someone to discreetly remove Bunker Hill's raider problem. In the past, they've paid off Zeller and his gang to leave their caravans - and the town itself - alone. Recently, though, Zeller's been demanding more money and then attacking caravans regardless. Kessler would like the problem to go away.

Zeller and his gang are located in the East Boston Preparatory School due east of Bunker Hill (across the water and just north of Boston Airport). The school has three floors and can contain anywhere from a dozen to 30 raiders. On the third floor, "Judge" Zeller has a makeshift throne and numerous prison cells in which you'll find the caravan prisoners. It's recommended that you clear the building of all raiders before freeing the prisoners, since they will run through the building and to the back entrance.

Note: Even if you have previously cleared the prep school location, it will again be full of raiders and Zeller.