what can i say?

I had change all my tuition class timetable.I make it a bit tighter than last time after operation.Please don't be supprise about when i occur.But because of this i tell my mom how i arrange.After than she say why you give yourself to be in doing so troublesome work,travelling from Kuala Lumpur to Petaling Jaya.I do so just because she complain that the consumption of petrol travel to Petaling Jaya use up more than Kuala Lumpur,in the comparison.So,i make it like that and she still want to scold me.I just help her to save up some petrol also a fault.I have no idea already.What can i say?Somemore she say the travelling time was longer.Since she say so i do some changes and so waht i change,i get nothing but scold.With this i also can save up some tuition fees also.Am i not understand my parents or they does not understand what am i doing.Even though i explain,they also still can continue scold until they feel good then only they stop scolding.Really no idea on how to cope them.