Malaysia is wonderful place to live and fly but unfortunately with this kind of salary, you'd only enjoy the place but wont be able to save much, if any in your case
doing the math:
12000RM per month - 27% tax = 8760RM + (80 hours X 195) = 24360RM / 3.505 = 6950USD, lets say 7000USD
Minus
Rental in Subang Jaya, USJ or Shah Alam (the nearest decent locations i could remember) 1000-1500USD including utilities
Petrol/Toll to/from KLIA about 300USD a month
Cars (expensive to buy unless you chose Proton), costs you about 15000USD for a Wira
Food very cheap and very good
Booze expensive unless you stay in Langkawi or Tioman
Overall, you should consider: Do you want the money or the experience, if you want money then its not worth it; NAS, QR, EY offer much better (double) package, if you are after experience, then you'll definitely enjoy it
Regards