How can i qualify for an institute asking for 10+2+4 pattern if i have a 3 yr degree, can i do an additional 1 yr diploma for the sake of it

i have completed a 3 year B.C.A, now i am looking for admission in design schools across india, but they demand 10+2+4 pattern, now i don't get whether the 4 is necessarily a 4 years degree or just 4 years of education. if later is the case can i do a 1 year diploma to fall under 10+2+4 pattern?