is the money lawful to spend.

my dad gave me money for my tuition (academic studies) but the tuition didn't take money this month, would it be lawful to spend this money on study material or courses as such (online) for the same purpose (academics)?? or is it absolutely haram and i should return it to my father.

I have a second question, i get money for travelling, now sometimes I save it up and use a lesser preferred vehicle and use that money for my benifit.....is that haram?

note: in the second case, they wouldn't mind all that much that i use money here and there and there is no other way for me to get extra money to spend on myself and stuff unless i ask them for it specifically.