Higher education in US,Australia,UK or Germany

[belladonna]

I am a BTECH engg student (starting 4th yr) in chennai.I have had quite a few arrears and cleared a few of them.Now I want to know if these arrears will affect my chances of higher education abroad.

Then If I clear all these subjects by the 4th yr and I get an aggregate of 70% will I have a good chance?

And will a good score in GRE/TOEFL help me get a good college abroad(irrespective of the arrears).Thank u.