If you think that just learning Chinese up to Standard 6 at SRJK© is going to equip you with sufficient proficiency in the language to be able to
"have an advantage with foreign companies that invest in PRC",
you are deluding yourself. While I do not deny that learning Chinese up to Standard 6 at SRJK© brings your ability in Chinese to a relatively good level, it is
not enough for professional purposes. You will not even have sufficient vocabulary to make a boardroom presentation or engage clients, and you will find yourself code-switching with English and fumbling through Google Translate for every second or third word that you encounter. Would you say that "learning English until Standard 6 is sufficient to engage the English-speaking market and workforce"? If the answer is obviously "
no", then why the double standards? I know people who have this same mindset - after their kids completed 6 years of SRJK©, off they went to international school. Guess what: Fast-forward 1-2 years later, and they could barely string a sentence together in Chinese. Even worse if the family does not speak Chinese at home.
If you want to learn Chinese to a usable level and retain it for life, then there are no two ways about it than to walk through the established systems: One is to continue learning it at government secondary school, preferably at an SMJK© where SPM Chinese is compulsory, or at an SMK that offers the subject (and even then the
absolute minimum is to learn it to Form 3 before you decide you want to drop the subject), Otherwise, and even better, go to a Chinese Independent High School. Don't even start with me on international schools offering "
Chinese elective classes in Year X or Year Y" - you will learn the same stuff that you learned in SRJK©, and you will retain
nothing.