Greetings,

So what typically happens during spot counselling is that the colleges invite applications for admission against the vacant seats that they have. The vacant seats could be from any category (general/reserved/ews) and only those candidates eligible under that category would be able to apply against that vacant seat. (unless the college decides to convert its general seats into reserved or vice versa just to fill them)

if you are a category student then keep an eye out for spot counselling notifications released by universities of your choice and see how many seats remain for admission and apply accordingly since many times it is  a matter of luck to claim a seat when other contenders are absent or do not possess the required documents.

Hope it helped, Good day!