Hi wjnaish,

I have to sort through the achieve and see...But it's quite easy to master this 赶上:)

It means happen to; find oneself in(a situation); avail oneself of (an opportunity)

i.e.

回家的时候赶上下雨了 when I was walking home, it happened to rain.

出去吃饭赶上有人在拍电影 Out having a meal, someone happens to film there.

Let me know if you have further questions:)