I need help from fellow singers and music experts?

In 2 months, I'd be singing in this concert thing for my school and I really want to make a good impression^^ But I'm struggling with which song to choose, I have a mellow sort of strong voice and i chose;Listen-Beyonce, Everytime-Britney Spears, A moment like this-Kelly Clarkson, Hero-Mariah Carey and Note to God-Jojo...My music teacher and trainer says they're all good songs for me but I'd appreciate your help..THANKS!