If you take a bus, there is only bus No.39 to Mianyang Middle School Cai Ying School, and there are only two stops. Get off at the terminal (Hanlongdao Garden City) and ask a tricycle master or passerby casually. It's only a short walk. I'm really afraid I can't find it. You can also find a tricycle master to take you to the school gate (2 yuan) at the place where you get off, but make it clear whether you want to go to primary school or junior high school, otherwise you will be easily wronged!
Reminder: Changhong Century City can't take bus No.43! Because no.43 doesn't pass Changhong Century City.
I hope it helps.