What is better after three year diploma job or higher education like degree course &tell me name of insititute

tell me what is better after diploma

DEGREE COURSES IN REPUTED UNIVERSITY OR COLLEGE IN COMPUTER SCIENCE AND APPLICATIONS.

First of all, do you mean high school diploma or a diploma from a college degree?
Either way, higher ed will always be better in the long run from a purely economic standpoint.
If you can get accepted to a local college or state university, and qualify for financial aid, take it and do your very best.
If you start out your life with just a high school diploma, you can count on making the lowest amount of money for the rest of your life. If you get even a 2 year (Associates) degree from a university, or better yet a 4 year degree (bachelors), you will be making a signifigantly larger amount of money for the rest of your life.
Looking at the numbers: Do you want to make $16,000 a year and be begging for bonuses like medical coverage? Or would you rather make $40,000 a year and have companies fighting over you by offering better bonuses than the other guy?
Education is the key here. A qualified person with some background in the field is always more valuable than somebody walking in off the street. When it comes to employment, companies consider a high school diploma "no education".
Most importantly though, when considering college, find a degree that actually has a future. Ask a guidance counselor what fields/areas of employment are experiencing shortages of employees. For example, medical professionals continue to be in high demand. Nursing is a great possibility if you have the stomach for it.

If you have an assured job join that job. Pursue any degree course of your choice while at job. Make hay while sun shines.

If you can afforad then go for higher studys, do B'E from any institute.