Jump and hit the launchpad, and collect the gold at the top. Fall down towards the left side and hit the next launchpad (the gauss turrets really shouldn't bother you that much), which will propel you to the diagonal launchpad. Use it to climb up to the top left switch, and if you did the beginning quickly enough the zap drones should still be away from that corner. Run across and jump to the right side (get the exit switch on the way) and get the next switch.