Hi aspirant

You can apply to your state combined entrance examination.Each state has their government and private diploma colleges .So if you wish to get into that colleges then you schould apply to State entrance examination.

And if you want colleges of different state then you will have to apply in the entrance exam conducted by that state where you want admission .

Visit the link given below to see the names of entrance exams conducted in india for admission in diploma:

https://engineering.careers360.com/exams?level=4

Hope this was helpful.

All the best.