hi every bady my name is ilham i'm maried and i have a boy i'm here to learn english well not chat w
On ne dirait pas just "years". On peut dire "I'm 13 and a half" ou "I'm 13 and a half years old".
"I am in XXth grade at YY school"
Je pense que le 5ème est le meme de "7th" ou "8th grade" dans "Junior High" ou "Middle School" . Alors, "I am in 8th grade at Joan of Arc middle school".