that same track.
Changing track is possible and allowed but it's always difficult and  
time consuming. You have to start all over again.
So when you are at the begining of your career, choose wisely. Think  
deep. Think hard and then only choose.
Taking up whatever job that is on offer, and whatever is given is no  
longer an option. Choose!!!
Good luck!!
More career advice can be found via this link http://my-aesi.blogspot.com/search?q=advice