Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_29970488_2 (hometown VARCHAR, previous_school VARCHAR)

### Question ###
How many hometowns are there when Charis Prep was the previous school?

### Accurate SQL ###

SELECT COUNT(hometown) FROM table_29970488_2 WHERE previous_school = "Charis Prep"