On takeoff training from off the runway I taxied on the runway and braked. Used one Airbus throttle it reached 2600 RPM. The second throttle did nothing. Released the brake. Down the runway the trainer said “too far down the runway. I was then placed on the runway and I went to 2600 RPM and released the brake. Went down the runway and tookoff. Reached 70 knots but trainer said " not fast enough”.