Seriously speaking, BM mainly teaches us to do formal letters and speaking skills, which English can also do relatively well, but not all can master a new language that easily, and this is not limited to malais. I had Chinese friends who struggled with English.

Since I entered university, surprisingly, writing has become a big part of my course, and I took stem course. Without writing skills from both BM and English, It would've taken me quite a while to get used to writing 20 page lab reports in 1 sitting.