Most of the aforementioned levels of networking can begin even before you have filled in your application, and the best way to do this is by visiting the campus of your target B-school! Be it the admissions committee members, professors, fellow applicants, or alumni
Spend time with the AdCom - The admissions committee is not just a few heads who decide the final applicants. Rather, the entire admissions lounge is brimming with AdCom members and student volunteers who will be more than happy to discuss relevant aspects of the admission process.
Visit the classroom - International B-school classrooms are likely to be widely different from your regular college. So, this is an experience that you should get beforehand if you are on a campus visit.
Catch social activities - While the admissions center and the classrooms are your primary locations for building networks, if you can catch a weekend social activity then you will be able to meet a host of other important members of the B-school circle such as alumni
Connect on social media - Apart from connecting with alumni members on platforms like Twitter and Linkedin, you should also follow all your target B-schools on their social media channels. Not only will you come across a lot of relevant information
Talk to current students - Most applicants spend their networking energy on AdCom members, who are difficult to track down online, and alumni members, who are extremely busy people with professional lives.