well it depends lo.. which working environment u think is good is the most important..

then next u check the salary.. my friend graduated in mechanics but his salary only 300 a month coz still consider fresh graduate.. then now he changed to sales where his salary is 800... for mechanic the salary to rise need around 2 years.. and somemore.. 300 is sooo low...

it depends lo.. but i think it doesn't necessary to work what u study for.. u can always learn around and get experience.. ^^ just what i think.. cheers.