im from ssgc..went to ssgps, ssgkg..
about half the people in ssgc are from ssgps..
half from outside..
so the chance seems smaller...
but actually...from what i see..(just between ywgs and ssgc) the admissions is actually quite similar...
most of my frds had chosen ssgc 1st choice..and got in..their frds in ywgs chose that as first choice and got in..maybe because more people apply ywgs? don't know
it's just a personal choice