Hi, 

Since you belong to RBA , you have reserved seats . 

So there are 20% seats reserved for RBA in all government colleges that accept admission through jkcet.  Since you got 21.75 marks , your rank would be somewhere between 2500 and 4000.  If you get a rank within 200 , admission to any branch is confirmed in GCET . A rank within 1000 will get you a seat in GCET . I  dont think you would be able to secure admission to GCET or other government colleges with this rank even in RBA . There might be reservation for girls . You can try that way .

Hope this was helpful. 

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