Daycare now, Irisflorets in Gachibowli for pre-nursery later? Trying to understand how it works

Our son is under a year and goes to daycare on weekdays. Happy there, no complaints. But I drive past Irisflorets in Gachibowli most days and it's got me thinking about the next step. Things I can't work out from the outside: what age do they take children into pre-nursery? Is it a half day? Do most kids come in from a daycare, or straight from home? I'm also unsure whether moving at pre-nursery makes sense when the school only goes up to class 3. That's another move a few years later. Or is that normal for this kind of school and I'm overthinking it? My partner thinks I am.