All about Physics of XI and XII in model lecture. In model lecture they do lot of cross question but if you give logical and analytical answers they are satisfied even if you are not completely correct. In interview about present salary and preferred job location.
I would first remind the student of the course fee which the parent has already paid and how many hours of class are left in the session. I would then remind the rest of the class of the curriculum that is left and the date of the examination. If that too does not instill a sense of responsibility in everyone, I would not flinch away from sending the particular student out of class to continue in peace.