Yes, there is a very high chance of getting a full seat (berth) in RAC (Reservation Against Cancellation) status on Indian Railways, especially after the final chart is prepared. RAC status technically guarantees you travel but only provides a "sitting" space shared with another passenger on a side-lower berth. However, if any passenger with a "Confirmed" (CNF) status cancels their ticket or simply does not board the train, that vacant berth is immediately allotted to the person with the lowest RAC number. After the train departs, the Ticket Examiner (TTE) will check for "No Shows" and will systematically upgrade RAC passengers to full berths. If your RAC number is low (e.g., RAC 1 to 10), your chances of getting a full berth for the night are excellent. To improve your odds, you should check in with the TTE shortly after boarding, as they have the authority to assign any unallocated or vacant berths to RAC passengers on a first-come, first-served basis according to the manifest.