Gee - you don't have a clue. You are going to waste an awful lot of money if you don't wise up.
Don't sit there fixated on an airline career if you can't nail down a job or obtain decent academic qualifications behind you. You don't appear to have any idea of how to get there other than taking the lowest cost route, which is totally incorrect, and through which you will probably end up with a worthless licence as you can't live and work in the US following training.
Do you have any experience of teaching people? Are you any good? As if not, FI is a little foolish a route to take.
Taking GAPAN aptitude tests does not preclude you from sorting out your academic background in any way - it shows you whether you have the capacity to become a pilot or not.
Read all of this on this link, then come back and ask again:
http://www.balpa.org.uk/intranet/How-to-bec/index.htm