What i should opt...a PO or LECTURER?

I jst finished my BSc nd waiting 4 results. i want to make my carrier in teaching nd its my dream to be a lecturer of zoology. but my father which is going to be retired from his job by 2014 wants some quick results.he wants at least one of us (2 broths nd 1 sis) in job before his retirement. my way to lecturership is time taken at least 3-4 years. nw i m in a suspense. to be a bank po is easy and only a year is sufficiet to get it bt.....off i cant think abt others