There are 3 ways to apply for Yale university.
It will accept any one of these applications and the preference order of any application does not exist.The students shall only submit one application per admission cycle.
As far as scholarship is concerned,Yale follows the "need blind" admission policy.It does not provide merit based scholarship.However,if you excel in academics,sports,arts,culture etc. then you will be able to find scholarships from different sources.
Hope this helps.