hii Saurabh , 

According to last year cut off of BHU PET programm , you have very less chance to get admission in main campus , but you must  be wait for 2nd or 3rd round counciling . But the chance of admission is very less .  You can apply for some other university like DU and state university for M.A. political science. 

For further updates visit - https://www.google.com/url?sa=t&source=web&rct=j&url=https://university.careers360.com/articles/bhu-pet-cut-off/amp&ved=2ahUKEwi0o4nx2PTiAhWJaCsKHb81BkkQFjAFegQIChAB&usg=AOvVaw3Fws9cf1mNJwzCL5XX4XwZ&ampcf=1

Hope it helps !!!!