Hello,is it wise to take admission in ISBS pgdm if i have 3 years of work ex in TCS? and what will be package offered any idea?

Since you have a good 3 years work experienec your chance of getting a good placement compared to other students is much higher. FYI, there are some companies which prefer students who have work experience and are engineer. Since you fulfill both the criteria you have a very good chance of fethching