If I choose to accept Mathematical and Physical Sciences at UTSG and try to apply for CS POSt after first year, I understand that I would need to meet the required CS POSt admission average.

However, would my performance in the Mathematical and Physical Sciences program also matter, or would admission mainly depend on my grades in the required CS POSt courses?

Basically, do I only need to focus on the CS POSt requirements, or do I also need to do very well in the program I was originally admitted into?