It really depends on the University you are planning to come to. If is a private university like BRAC or NSU, the quality is internationally recognised. If it is a public university like IBA or Dhaka University, it is also quite good.
As for part time jobs, you can do plenty of online work such as writing assignments for other students which pays...fairly well if you undertake a lot of work. The cost of living can be a bit high in Dhaka, though so you will have to watch out.