hi,

see most of the engineering entrance exam needs 10+2 course qualification to get admission in btech exam. see there is one advantage for diploma passed candidates that you can join b.tech through lateral entry exam. and you can directly join from second year of btech course. in that way your 1 year will be saved.

you may check the below link to know about cgpet criteria where diploma course is not mention.

https://engineering.careers360.com/articles/cg-pet-eligibility-criteria