Hi dear,
The government and other reputed colleges having good faculty and placements offer admission either on jee mains basis or have their own entrance tests for admission.
So , you can only get some private colleges which provide admission on +2 basis.But the placement opportunities in those collegs won't be good enough.
But ,there are some colleges, who provide seats through direct admission in management quota for the students who could not give jee mains and all.In such institutions,you have to pay more but will get good education and opportunities.
Please do mention the state where you want admission.
Else,visit this link for the names of such colleges
https://www.google.co.in/m?q=engineering+colleges+which+take+direct+admission&client=ms-opera-mobile&channel=new&espv=1

Best of Luck!!

Hello dear aspirant
There are many colleges,  most of which are private, which can give you admission based on 12th class marks,  like some good colleges of UPTU located in Delhi NCR.
Chandigarh university is also one such university which can give you admission based on 12th class marks. It has a good placement and a good infrastructure. There are some state counsellings as well which can give you admission on 12th class marks.

For more information,  visit the following link..
https://www.google.com/amp/s/engineering.careers360.com/articles/btech-admissions-on-basis-of-class-12th/amp

Hope I am clear