3 K is good at your level. Save RM1.5 K a month is pretty hard as our current life style is high. Further study will be the best choice you have. But how is what you should concern. Do you have enough money to further study? Will you be able to invest all your 3 - 5 years saving for study?

You will be back to square 1 when you obtain your degree at age 32 or 33 But you can get a higher pay probably RM 4 K to 5 K. Again you need to save money for house, car and wife. Imagine what is RM 5K in the next 4 years. So you might need to consider whether it worth to put so much effort just to obtain a higher pay. Why not put your effort and money to build your own business. The return might better than study.
Just my opinion.