Guidance needed

I have joined PSU bank as probationary officers last year in june and successfully completed my probation of one year and got confirmation letter last month. I am having bond of Rs 2lakh for 3 year. I have applied for ssc cgl 2014 in jan 2014, first paper of which is going to be held in Oct. But till now I have not informed anything to bank. Please guide me what steps to be taken to not get any legal problem in leaving bank. Please give me format of the letter to be send if possible. Please guide me. Thankyou.