I oppose to teach maths n science in Bahasa Malaysia.
From my own experience, i feel it's easier to catch up maths and science in english.
In addition, it's really difficult to translate every wordings from English into Malay, and the translation might be wrong and not meaningful at all sometimes.
Besides, if primary and secondary school students learning maths and science in Bahasa Malaysia, they might find it super tough with this transition when they further their studies in universities which teach mostly in English. I didn't have any chance to study math and science in English during my school time. As a medical student, i think that this government's decision was sooo dissapointing.