You don’t need to score high on a score out meet. Most gymnasts score the minimum requirement to move up levels. First speak with your coach to discuss your readiness. He/she might be able to put your mind at ease.
While on vacation, do some handstands, core work and some stretching. Stay active, walk, swim. You can also do some mental choreography. Go through your routines in your head and envision perfecting them. Go through each routine skill by skill talking yourself into what goes with skill (i.e., straight legs, point toes, hollow, tight abs, see the beam, breathe, every little minute detail). If you have 1 or 2 lb hand weights, put them on and do just the arm movements of your vault, beam and floor routines.
I’m only recommending the above because you feel you are not ready and you are at a higher level. Typically, I’d say, forget gym and enjoy your vacation.