some school regs have been transferred to manx museum enqiries@mnh.gov.im

others are still with school - some schools are now on web - look on www.gov.im to see if they give info

Priscilla Lewthwaite (sec IoMFHS but not on line - possibly try emailing library) had a private collection of transcribed/copied school regs - some of these are mentioned in various issues of fam hist soc (of which I trust you are a member)