Congrats on being called. It ain't over yet. As Triple-C stated, get the scholarship first and you'll cross that bridge when you get there. There are unusual circumstances surrounding this year's award. During the award's ceremony, you all will be able to raise the issue on open grounds (I'm almost certain all 10 awardees will be in the same fix. It will even be more critical for US awardees since almost all US schools resume before September).
In any case, you guys can raise the point that Mobil (or NNPC) should help get proprietary clearance for speedy visa application, or allow you defer for a year. There will be strength in numbers since most, if not all, will be in the same shoes.
But, get the award first.....
