I will be taking my 13 year old to Buenos Aires for the month of August. He will attend a small private school there while we are on sumemr break. How much are private school tuitions ( annual basis please) as I have no idea how it compares to a large city's east coast tuition in the US. Also how do the grades work. For example, most children in 7th grade at my child's school turned 13 between June '10 and June '11 . What grade would be appropriate to be in for this age group for this summer.