You do the V Ash QRH, but if both engines flame out (that is what happens in the sim), it will happen in the middle of the QRH checklist.
Upon losing both engines, follow ECAM, set about 1º pitch down as you might experience unreliable speed as well.
The ECAM will direct you to the QRH dual engine failure c/l. Do the QRH checklist because it contains everything you need, including the aviate, navigate, communicate part!
Before focusing on engine relight follow the aviate-navigate-communicate steps of the QRH. IF at high cruising level don't haste: windmilling relight envelope starts at FL 300. there is not much hope or relighting above that. Keep your pitch, refine it with the c/l value according to weight and check if you have an unrealiable airspeed. if it happens, probably all pitot will clog simultaneously and ADRs will not detect anythings abnormal as they all agree. If there is uas, then stick to the pitch.
Once established on a HDG towards an airport within reach, ditching in the sea as close as possible to the coast, or to a suitable forced landing site, and on the pitch or speed for relight you must attempt relights two at a time (there is a trap, here. If you already pushed the WING A/ICE you should put it OFF).
Keep trying to relight engines, and start the APU when below FL 250. If no success, reduce speed to have about green dot by the time you reach FL 200. Then you can try assisted starts with the APU BLEED, one at a time now, good news is you glide some more now.
The instructor has decided before hand at what moment he will allow one engine to relight. Be careful not to mechanically make another start attempt in an engine without first checking if it did lit! Some models help with an AVAIL light, others you need to advance the levers and see.
Once you have one engine back, you can worry about the unreliable speed, but ignore the thrust settings as those are for two engines. The pitch values however should be ok.