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_name_13 ( pupil_teacher_ratio INTEGER, city VARCHAR, students VARCHAR )

### Question ###
What is the lowest pupil to teacher ratio for Saratoga schools with smaller than 1213 students?

### Accurate SQL ###

SELECT MIN(pupil_teacher_ratio) FROM table_name_13 WHERE city = "saratoga" AND students < 1213