Work on tone quality. Make sure you sound mature and do your best hitting those high notes. I think you should sing an English song just so you dont embarrass yourself with those korean words. That's what I would do. HMM. Pick a song that can show off your vocals well. No holding back aight? :)

I wanna come watch!! You can do it :D Wear your tiger pajamas and be all "I AM JONGHYUN. HEAR ME ROAR."

i thought you didn't want to audition at SM xD

I wanted to audition as well but my singing is soooooooooo crap and eugh, I shouldn't bother LOL. Though I haven't heard you sing before, I'd say you should do it to get the experience and tips on improvement. I've personally never tried auditioning so I'm a little clueless there too xD Anyway, good luck dear! c: ♥