Some top universities have very specific requirements on HS classes. For example, Princeton requires:
* four years of English (including continued practice in writing)
* four years of mathematics (including calculus for students interested in engineering)
* four years of one foreign language
* at least two years of laboratory science (including physics and chemistry for students interested in engineering)
* at least two years of history
It does not look very good if a student only take two years of Math (even for English major). Having said that, if the kid is only 4th grade, you will have many opportunities to make adjustment along the way. I wouldn't worry about it now.
