Help please!!!!!!!!!!?

ugg.... i hate getting pranked. and now im getting txts from someone i dont know. i know there from school though, they were pretending to be someone, and they were asking who i like, but i wouldnt tell them, i dont even tell my own friends. anyway there getting on my nerves and idk what to do they said "look for me at school tom". so i just dont know what to do, they told me someone dared them