为什么考SAT Subject Math 2的学生数比其它科多很多？

是化学，生物，物理的两倍，是其它科目的更多倍

https://en.wikipedia.org/wiki/SAT_Subject_Tests

Test	Subject	Meanscore (2016)[8]	Standard deviation(2016)[8]	Number of Students (2016)[8]	Notes
SAT Subject Test in Mathematics Level 2	Mathematics	690	101	145,140	Formerly Math II or IIC. Consists of algebra, geometry, trigonometry, functions, statistics and a few miscellaneous topics.[10]
SAT Subject Test in Biology E/M	Biology	616 (E) 647 (M)	114 (E) 110 (M)	72,196 in total,  31,965 (E) 40,231 (M)	Students have a choice of taking either an ecological ("E") or molecular ("M") biology oriented test.
SAT Subject Test in Chemistry	Chemistry	668	104	71,173
SAT Subject Test in United States History	U.S. History	624	115	66,967	Formerly American History and Social Studies
SAT Subject Test in Mathematics Level 1	Mathematics	599	116	66,058	Formerly Math I or IC.Basic algebra and geometrysuch as Monomials, Polynomialsand the Pythagorean theorem are assessed in the beginning of the exam before progressing into basic trigonometry, algebraic functions, elementary statistics and a few miscellaneous topics.[9]
SAT Subject Test in Literature	Literature	599	122	57,761
SAT Subject Test in Physics	Physics	667	104	56,751
SAT Subject Test in World History	World History	615	109	15,542	Formerly European History and World Cultures
SAT Subject Test in French	French	634	121	6,800
SAT Subject Test in Chinese with Listening	Chinese	761	66	4,925
SAT Subject Test in Spanish with Listening	Spanish	660	108	2,914
SAT Subject Test in Latin	Latin	632	109	2,483
SAT Subject Test in Korean with Listening	Korean	764	64	1,891
SAT Subject Test in French with Listening	French	664	113	1,533
SAT Subject Test in Japanese with Listening	Japanese	704	116	1,317
SAT Subject Test in German	German	636	124	621
SAT Subject Test in Italian	Italian	677	114	488
SAT Subject Test in German with Listening	German	629	121	479
SAT Subject Test in Modern Hebrew	Modern Hebrew	614	145	344