EPGY is aligned with common core; your SSA has access to a standards browser if you want to find where in EPGY a specific standard is addressed. EPGY's curriculum is pretty straight forward, so many parents supplement with non-routine and discreet problems. In addition to Singapore Math word problems, Edward Zaccaro's Challenge Math books are popular to supplement to EPGY in the lower grades. Art of Problem Solving and math competitions like MOEMS are popular supplements in upper elementary and in middle school grades.
I'm no expert because I haven't actually used the program, but from what I've seen Ten Marks contains no where near the level of problems in EPGY, but you'd really need the opinion of someone who has used both.
