In my personal opinion you should maintain your job and you should prepare yourself for the exam with your job. Dear brother its very difficult to find a government job in Pakistan once you leave it. Furthermore there is no surety that you will certainly get the job of CSP. I don't want to say that the exam is very difficult and you are too weak to get through the exam but i really want to say that the exam is just a game of luck. Again i say that you may or may not become a CSP but i can say with a high degree of surety that you may not find a government job once you leave it.

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Think like a man of action and act like a man of thought.