Hello,

You have not mentioned your subject in which you had your diploma. However, I'll explain it to you without it. A diploma equivalent to 12th means that the 3 years of diploma is equal to completing class 12th. The 12th equivalent certificate will have the stream based on your diploma. If you had a science related diploma then your stream is Science and if you had a commerce related diploma then your stream is Commerce and if you had a humanities/arts related diploma then your stream is Arts.

I hope this helps you,

All the best