Misplace book in school bag

Today found another classmate book inside my son's school bag. Yeah looks like they have misplaced the book. Anyway found her book but not his book.

I have informed the mom about her daughter book also reminds her to take it from my son. Busy day for me I guided him to do homeworks and spellings. I can tell you the spelling is tougher. Three different language of spelling BM, BI and BC.

I know he's poor in BM AND BC.