No one ever invested in a bunch of materials. We have sets of the old textbooks and use them as resources sometimes. There's an emphasis on mixing things up - approaching problems different ways, trying new technology, peer-on-peer interaction, games, labs (the mental meatball experiment), combined with having to stay after school if they are making a C or D. So, a fair amount of Common Core-like ideas, but the curriculum coach has always done things this way. I am a paraprofessional and have the luxury of working with small groups. If I see their work I can spot misconceptions in real time which is helpful. This is a charter school; they have their pluses and minuses but in general I think they do a pretty good job.
There was a push toward online testing but I think it was only peripherally related to Common Core. The school wanted to leverage Khan Academy and IXL Math resources which is great as long as students are using scratch paper and doing the math instead of staring at the screen and trying to do it without scratch paper. The bubble sheets get used a lot too and a machine can scan them. I except to push the "show your work" idea as students seem somewhat resistant.
These guys need procedural fluency and a lot of practice with it. They pick up on concepts, but need to develop persistence with pencil and paper. There is a hell of a lot of testing. Some is good and necessary but a single-subject test should be wrapped up in one day. Straddling 2 days, 3-6 times a year, that sure adds up.
ETA: It's a charter school. There is more flexibility. Charters have their problems but they are usually smaller, somewhat stand-alone entities where 2 or 3 people in brief conference can iron out solutions without kicking things up the food chain.