My cousin is in SSE and clearly it doesn’t allow anyone to enroll easily. You will notice that the merit list overflows easily. If you get in with merit, then congratulations you will pay the regular official fees; however, if you get in through the management quota, then you will have to pay double the fees mentioned on the official website.
Secondly, there is a SET score, which you must take seriously because it's not a part of a formal procedure. Rather, it is requisite for the admission process. My cousin was literally saved because of his SET score.
Lastly, the admission committee grills you to check whether you qualify to be a part of the Symbiosis club or not. You need good contacts to get into the program because if you're interested in BBA, you'll see how the privileged kids get in quickly through contacts.
Focus on your SET, Interview preparation, and the WAT which you can easily practice online. In the interview, loosen up a bit and introduce yourself with confidence. Be honest and carry proof of everything you claim.