Hello Subi Paeween, 

You take addmission in Jawaharalal Nehru University for doing Post Graduation in Arabic, you have to follow following steps, 

1. Register and applu

2. Eligible candidates (who have completed their graduation degree in an recogonized university with minimum of 50% marks or mare) have to write the entrance exam called JNUEE (Jawaharlal Nehru University Entrance Exam).

3. A persnal interview will be conducted

4. Then your results will be declared, where you will know if you are selected or not. 

Hope above information helped you! All the best!