Well, I believe it's a personal issue of priority, if u feel a job opportunity in NNPC comes once in a blue moon and u dont think u stand a chance of getting d PTDF schship, u can 4get about PTDF, at least u can always get other schship opportunities. Dont forget dat a masters in UK is no guarantee of getting a good job. But if u r so confident of your preparations for PTDF then u can give up NNPC job opportunity