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_42 (points INTEGER, year VARCHAR, class VARCHAR)

### Question ###
What is the sum of Points, when Year is after 1959, and when Class is 250cc?

### Accurate SQL ###

SELECT SUM(points) FROM table_name_42 WHERE year > 1959 AND class = "250cc"