Hi aspirants

Don't be confused. Just concentrate on your studies. you can get a good job with diploma degree. But in some college they will conduct their own university exam. If you are willing to do B. tech after diploma many private college around India  are offering b. tech courses without JEE you can join in them. But if you are willing to do in government university like IIT, NIT you have to clear JEE main and JEE advanced. Many state or private colleges take admission of diploma holder in second year directly but not the IITs or NITs.

for more information about college click the link

https://engineering.careers360.com/colleges/list-of-private-engineering-colleges-in-india

Hope this Helps

good luck!