[bioman]

Take a GRADUATE diploma. This is meant for degree-holders unlike mere diplomas for O-level graduates.

As an engineering graduate, you would have honed systematic process thinking that HR professionals appreciate. Engineers can end up as HR Directors.

I think companies can accept you as a HR generalist first, perhaps with a fresh graduate salary or slightly higher due to no HR experience. Thereafter, get a graduate diploma. Presently understandably, you have no clue which to specialise as you have no exposure. Specialise later when you are more certain of your direction.

Masters is too huge an investment at this stage, perhaps consider when you have reached HR management level.