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_45 (class VARCHAR, machine VARCHAR, points VARCHAR)

### Question ###
What class has nsr250 as the machine, with points greater than 97?

### Accurate SQL ###

SELECT class FROM table_name_45 WHERE machine = "nsr250" AND points > 97