Tom Booth-Amos will start the Sprint race from pole today after setting a best lap of 1min 32.075secs.
The Gearlink Kawasaki rider beat Dutchman Jamie van Sikkelerus by 0.329secs as Bradley Perie finished the session in third place.
Jack Scott was fourth – and once again the quickest of the GP2 runners while Jamie Perrin rounds out the top five.
Mason Law was the second fastest GP2 rider, ending the session in 17th overall, one spot ahead of third-placed GP2 man Jake Archer.
Quattro Group British Supersport & GP2 Cup, Donington Park, Qualifying:
1. Tom Booth-Amos (Gearlink Kawasaki) 1min 32.075s
2. Jamie van Sikkelerus (MPM Routz Racing) +0.329s
3. Bradley Perie (Appleyard Macadam Racing) +0.392s
4. Jack Scott (One-Kovara Projects/RS Racing) +0.471s
5. Jamie Perrin (Jamie Perrin APS) +0.808s