calculating my finance

(liabilities) things needed to pay:
- piano lesson $180
- phone bills $50
- bus/train concession $52/45
- braces $360
- monthly allowance $100 = need good food mah... 100 is quite a lot already
total: $742



(income per month) work pay:
- prive 3days a week 8hrs each shift $192 x 4 = $768
- aranda 2days a week 4hrs each shift $48 x 4 = $192
- trueblue 1day a week 4hrs each shift $22 x 4 = $88
total: $1048


savings = $1048 - $742
= $306 (have to work 4 mths to get a laptop) wahuhuhuh...


is there an easier way out to get cash? sigh...