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Not necessary, it is your choice. If you are interested in continuing your study to gain more knowledge then you can do B.Tech after completing your Diploma in the respective engineering branch through lateral entry to get admission in B.Tech 2nd year directly. But it is advisable to complete your Degree after Diploma. If you join a job right after your Diploma then it will be more complicated to do B.Tech if you feel it's importance later. You can get a promotion quickly in a private company if you hold the degree doing a Diploma level service. In government organisation, you can sit in the departmental examination to get promotion in a higher rank in reserve category. Salary can vary from 10,000K to 15,000K in government organisation of Diploma & degree engineer. In a private company, it's not a matter of concern.