It might be challenging but not entirely impossible to get admission into AKTU (Dr. A.P.J. Abdul Kalam Technical University) B.Tech programs if your NIOS Class 12 results are declared in December.

AKTU admissions for B.Tech programs typically happen several months before NIOS December results. The process might involve entrance exams like UPSEE (Uttar Pradesh State Entrance Exam) followed by counselling based on merit rank.By the time your NIOS results are declared in December, AKTU admissions and counselling might already be over. You might miss the application window for the current academic year.

https://www.careers360.com/university/dr-apj-abdul-kalam-technical-university-lucknow

I hope it helps!