i am aditya pursuing my btech final year. i am planning to apply for fall 2014
i have certain doubts which i request anyone to help me with

b.tech GPA- 68%(3 backlogs in first year and cleared it in frst attempt)
GRE-326

TOEFL- 102
and the thing is my brother has a H1-B visa and he is staying there in US from 5 years.

do my backlogs make my visa chances less even if i hav a good GRE score?

will any of these reasons make my visa chances less?