1.How did you get to the school?
I got there by bus.
get to +地点名词
get +地点副词(here there home等)
2.arrive in +大地点
arrive at +小地点
arrive +地点副词(here there home等)
eg.I arrived at school at 7 this morning.
I arrived in London last week.
I will arrive home soon.
3.reach不加介词
When will you reach Shanghai?
I reached home at7.
参考资料:written all by myself