Why don't all in English not just science n math. It's better, else the kids will hv headached switching between languages..... Imagine u gather with ur friends. Need to speak malay to Ali, mandarin to ahkow n then tamil to muthu.... Better all speak english

Most cannot follow the class since standard 1. And teacher only communicate with those who already know English. Those speak English at home ones.
I am surprised you didn't know this.

Of course it sounds simple when you’re giving two example. But when there are thousands of science term in English, it isn’t simple anymore.

Keseimbangan terma, legap, bebuli, pelakuran, peleburan, pengewapan, pemejaluwapan, perolakan, sinaran, haba pendam tetap (permanent bury heat? ), muatan pendam haba, malar, bendalir, tolok, pembiasan, pemantulan, perambatan, cembung, cekung, satah, berserenjang, sudut genting, logamaya.

I just went through two chapters of form 4 fizik and i already found so much term that you don’t use in conversational english nor in conversational BM and you might have hard time to translate and re-memorize.