If you have already paid security money for government colleges in Round 1, you usually do not need to do a fresh registration to apply for private colleges in Round 2, as long as both types of institutions are part of the same counselling process. What happens is that your Round 1 security deposit remains with the counselling authority and you are asked to pay the additional or higher security amount required for private colleges. The amount you initially paid for government seats is not wasted, rather it is adjusted or carried forward. New registration generally becomes necessary only during special rounds such as mop-up or stray vacancy rounds, depending on the specific rules of the counselling authority. Therefore, you can participate in Round 2 for private colleges by paying the required top-up security money while your Round 1 deposit continues to stay valid.