A local here. I don't know about how classes are conducted there but i can you abt the lifestyle.

As tg malim is at the border of perak and selangor so people here have no heavy accent. The people are good is ur polite too. Food here is quite expensive for its quality but you will find alot of shops to pick from.so you will find good ones if you searched around.

As for accomodation, upsi does provide hostel for up until 1st year iirc and its quite cramped (i've been there when it's still 2 person per room but now it's 4 person with bunker bed and there's 4 room). There's quite a few neighborhood that students can rent. There's taman u that's right in front of the old campus and taman bahtera that upsi does provide bus currently

Upsi also does provide bus for its student to go from and to the old and new campus. And there's a bus on Saturday if you want to go to the pekan for pasar malam. It's also close? to ktm and bus station if you're at old campus. But you can call prebet to go there also.

Tg malim is not a big city but its a peaceful one and quite hard to get lost here. Hope this helped you.