Hello Aspirant!

No, the basic difference between a B.Tech and Polytechnic engineering courses is that a B.Tech is a degree course while a Polytechnic is a diploma course in engineering. You should go for B.tech after 12th class as it will provide good placements and knowledge. Many top colleges don't provide lateral entry after diploma . So, it is better to give entrance exam after your 12th class to get into top colleges.

You can get direct second year admission in B.tech after diploma in various State Government Colleges.

Have a Nice Day!