Brie -
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I dont know your specific circumstances. A failed sim check is generally not because of a single problem, but maybe a combination of various factors...
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As an "old hand" in airline instruction with thousands of hours of simulator and line instruction, most failures of newly hired pilots (who often are competent CPL/IR/ME or even ATPL) are the "jet transition". They can fly a propeller aircraft obviously well, reciprocating or turboprop power, but handling a jet is different. It is not more difficult, merely different.
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Example -
In simulator evaluation (I do that with 737-200 simulators), I often see competent propeller pilot asked to reduce speed from 300 to 200... with their propeller aircraft background, they often will just make a "slight power" reduction of "1 knob" on the thrust levers... whereas the proper technique is to go to full idle thrust in a jet... remember, propellers provide drag in power reductions, not so with jets... I see propeller pilots attempting to increase a rate of descent on a glide slope by... power reduction...! They might not know that a glide slope adjustment is flown primarily with pitch trim, and that power is strictly speed in a jet...
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I would say that the "jet transition" is a problem that young pilots should address after obtaining their CPL/IR/ME... a quick fix would be an inexpensive CE-500 Citation type rating, which would give you some idea as to how a jet aircraft is flown, and concept of MCC and CRM...
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Brie, t'en fais pas trop, tâche de t'informer sur les raisons de ton échec. Si un de "mes gars" ne passe pas, je lui donne une seconde chance, et si nécessaire, 1 ou 2 heures de sim en plus... Bonne chance à toi -
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Happy contrails