My opinion
1) SK or SJK, will still require effort to speak english / bm / mandarin well. One of my MALAY employee is SK SMK student, but she cant even spell in Malay😂😂 cant speak english at all

2) My SJK SPM english sounds AhBeng, lots of grammar mistake. But it doesn't affect my career growth at all.

3) TBH... Lots of top management people speak Cantonese / mandarin. Except GLC / Government department