How to apply for merit scholarship? Are there separate applications from common app?

<<
My lazy boy has weak ECs comparing to most of people in cc. He is not very outgoing. He might not have great recs.
<<<

Then your son needs a new list if he’s wanting merit from schools that don’t award strictly for stats.

There would be no reason for UChi, GT, UMinn and UW to award merit to your son. These are top schools who have a lot of high stats applicants. They’ll use ECs, LORs, etc, for down-selection for their limited merit awards.

What do you want your end costs to be?

<<<
What can be his safeties? He likes to have major in physics / astrophysics / engineering. He is ok with big schools or medium size schools. So far our list consists of –
MIT
Stanford
U of Chicago
U of Wisc Madison (home state)
U of IL Urbana- Champaign
U C Berkeley
Cornell
Purdue
Ohio State
U of Indiana
Rice Univ
Case Western Reserve
Georgia Tech
Harvey Mudd

Too many reaches and need some matches. Any idea?

ACT 35
<<<<

Purdue will likely give $10k per year. Maybe a little more. Purdue has gotten stingy with merit.

Indiana likely around $10k-15k

Ohio State should give a nice award.

Case may require “interest”.

Berkeley…none.
UIUC …none or little
GT…none
Rice…none
UChi…none

MIT, Stanford, UChi, Rice, Cornell, HMU, …likely rejected for lack of ECs and LORs.