Does a 740 on the Math 2 “bolster” or strengthen a 740 on the SAT math section? My son was worried that his SAT math score was at or below the 25th percentile for a couple of his reaches. He’s not a STEM kid nor will he be pursuing a STEM major - in fact, he’s focused on a non-mathy social science and/or history (which is a cross between social science and humanities). He’d like to submit the Math 2 in order to demonstrate “math proficiency” but we are worried that it doesn’t add any information over and above his SAT Math score. One of the reaches does encourage subject tests but doesn’t specify the number or what type to take. He will have a 790 US History subject test to send them, as well as a 5 on his APUSH. The other reach considers subject tests completely supplemental and doesn’t really discuss them on the admissions page. The big question is whether to send the Math 2 subject score to these two uber-reachy schools.
FWIW, his verbal SAT was also 790. So 790/740 on the SATI and the SAT2! At least he’s consistent! 
It won’t hurt, so I would do it. It shows he’s well rounded.
Not that being well-rounded is a determining factor.
Agreed. Unless we’re talking M2 for MIT or Caltech, anything above 700 is in range for most colleges that “suggest” subject tests. And a 740/790 on both SAT I and II is a strong showing.
I will be a contrarian here and say don’t submit.
740 on Math 2 is 57th percentile, whereas on SAT I math it is 96th percentile:
https://secure-media.collegeboard.org/sat/pdf/sat-subject-tests-percentile-ranks.pdf
Don’t get caught up with percentiles. It is important to understand that for several subjects, the percentiles are depressed because so few colleges request Subject Tests, that the ones that do are the ultra selective ones. As a result, it is the high achieving kids taking the tests. No AO is sitting on the floor cross-referencing scores with percentiles.
Thank you all for the comments, including the contrarian point of view. S19 is not applying to any school that specifically requires a Math 2, although he was considering CMU/Dietrich at one point. Both of his “reachy-reaches” - in fact, all his top picks - are strong liberal arts programs w/in the context of a research university. While the major doesn’t need to be set in stone, his interests all point to areas other than STEM or Math. He has straight A’s in everything and has taken the hardest STEM courses available - he’s just not a STEM kid and his application will show that. His passions lie elsewhere.