Hello Chandu,

Well, if you paid partial admission fee too then it means your previous seat is retained and if you want to participate in CSAB 2020 then you have to again pay 36500/- for Gen and 21500/- for others and if you get a seat in CSAB then your previous paid fees will be refunded after deducting some processing fees as per the institute (like in BIT mesra 10000/- is processing fees)...

for more details you can refer to CSAB 2019 business Rule( CSAB Business Rule 2019 (https://csab.nic.in/CMS/Handler/FileHandler.ashx?i=File&ii=138&iii=Y) )

Hope this helps, and feel free to ask any further query...