I dont know about you but aerospace engineering have two paths. One path is those who wanted to get a straight payscale of 2.8-3.7k. Another path if for those (regardless of you are from nus,ntu,sim,sutd)who wants to go through an apprenticeship scheme whereby your starting pay will be 2.5k for 4 years or another company offering you 1.8k for 2 years. But after that the apprenticeship training,your pay will jump to 5k for the first year and it will keep on increasing due to your approvals and allowance.