How to usually get your role in New Champ Select
For all you "I can only play ADC and nothing else" or "Support or Feed" or "Top only" people. Here's a strategy to get the role you want, usually anyway.
Select your primary role, then in the secondary role ALWAYS PICK MID. Because many people want to play mid spamming Zed and Yasuo or even Anivia. Your probability of getting that secondary role is severely reduced, and because you cannot have a role that you want, you usually tend to get your primary role, with the off chance of getting midlane.
For midlaners, take Top lane as your secondary role, as that is also quite highly contested. and you can;t have midlane as secondary role, when it is your primary role QQ.