Astrology is to be used for solving your problems if you have any. It cannot be used for predicting events such as when you will get a promotion or when you will take your next leave and go for a vacation and where will you go for a holiday etc.
Yes you can find out the overall success in your career and associated gains therefrom as well as the measure of your job satisfaction etc. Please read my articles on this site as well as in http://navagrahastro.blogspot.in/
And if you still feel that such questions can be answered using astrology, do let me know.