No, a B.Tech student exiting after 3 years under the new education policy (NEP) won't be awarded a B.Tech degree.
The NEP mandates a minimum duration of four years for a B.Tech degree. This includes coursework, labs, projects, and internships. After completing the first three years of a B.Tech program under NEP, a student can opt for a B.Sc. (Honours) degree in a relevant field like Computer Science (CS), Electronics & Communication Engineering (ECE), etc. This exit option awards a recognized degree.

Many SSC positions require a Bachelor's degree in any discipline. A B.Sc. (Honours) degree in a relevant field would likely qualify.

A Bachelor's degree from a recognized university is the basic eligibility for the UPSC Civil Services Examination (CSE). A B.Sc. (Honours) degree would be sufficient. However, some UPSC CSE optional subjects might recommend or require a background in engineering or specific engineering disciplines.

https://competition.careers360.com/exams/upsc-cse

I hope it helps!