Hello

Tuition fees and living expenses constitute the actual cost of abroad study.

Tuition fees and living cost's decreasing order is USA>australia>UK> Germany.

One of the top university of USA is Harvard University,  of  Germany is Heidelberg university, of Australia is monash university and that of UK is oxford university.

I would recommend you to study in Australia because students choose to study there because of the cultural diversity, friendly acquaintances, and high quality of education.

Most affordable would be Germany.

Good luck.