What are my DS's chances

<p>DS is junior @ public high school.
GPA, weighted 4.6, unweighted 4.00
PSAT: 220 (SAT in 8th grade 800-M, 620-V), took SAT last week
APs: CALC BC -5, Chem - 5, Comp Sc A - 5
will be taking in May - Bio, US History, Statistics, possible Economics
EC: marching band, section leader (1 of 2 juniors), area band, brass ensemble, jazz band, debate, mock trial, academic team, class treasurer (2 yrs), newspaper op-ed editor, start up Key Club this year, tennis
College classes - calc 3, linear algera, real/complex analysis, differential equations, statistics (2 were result of scholarship from JHU Talent Search)
Tutors 9 middle school students - 8-12 hrs/week. </p>

<p>What are his chance for Stanford? He really likes math and is interested in that as well as possible double major with economics. Any suggestions of what he should stress in his application?</p>

<p>Thanks!</p>