minimise what you spend, maximise what you have.
a. apply for whatever fuck bursary, school schemes, study schemes that is available from school, GRC, clans, workplace etc. I assume his wife is working, say 3K, total household income 7K, average income per head below 2.5K- well qualify for schemes.
b. if his job allows, go part time during weekends as grab driver or delivery - 100 or 200 bucks per weekend is attainable.
c. if got smoking or buy 4D, stop. You'll be surprised how much you can save.
d. go buy stuff from Seng Song - buy housebrands. Seng Song i find is generally cheaper than NTUC, let alone Cold Storage.
e. If possible, rent out one room of HDB to generate some income. If child is still young, can squeeze into master bedroom (I assume 3-room HDB). You can take back the room when he is older.