Ted Wilkinson continued his strong Donington Park run as he secured pole with a 1min 44.233sec lap.
Wilkinson beat Jacob Stephenson by 0.278secs as Kalvin Kelly was third quickest to round out the front row.
Lewis Jones will head row two in fourth place, just one spot ahead of his Symcirrus Motorsport team-mate Chloe Jones.
HEL Performance British Junior Supersport Championship with Motocourse, qualifying:
1. Ted Wilkinson (RMB Racing) 1min 44.233
2. Jacob Stephenson (Kevin Stephenson) +0.278s
3. Kalvin Kelly (Completely Motorbikes Kawasaki) +0.422s
4. Lewis Jones (Symcirrus Motorsport) +0.455s
5. Chloe Jones (Symcirrus Motorsport) +0.476s