Hello

No without any entrance examination after 3 years diploma in Engineering from any Polytechnic any student cannot join in BTech courses B courses of any stream of engineering course of study. A student has to come through later entry system, For this he or she has to appear for a screening test. After qualifying the screening test he or she will be eligible for taking admission in 2nd year of 4 years BE or BTech courses of his or her choice of study, his  or her course of interest.

Hope this will help.