Because techinical and engineering subjects is very hot for them... the reason is because many of them don't have a strong command of english... so Business, Management, Law which requires alot of communication is generally not their top choice.

Their home industry and environment is much like singapore's 70s... booming with alot of opportunity in manufacturing and production... thus very industrial and engineering mindset.
Much like in the 70s and 80s... being and Engineer can be quite satki