Matched is risk free and legit way to make an extra income, take a look at the site below if you are interested:
studentmatchedbetting.com
From the free trial you can earn up to £70, and to prove it is legit here is an article:
telegraph.co.uk/finance/personalfinance/money-saving-tips/8185280/Is-this-a-bet-you-cant-lose.html
theguardian.com/money/2010/jul/24/free-bets-bookies
If you have any questions feel free to ask.