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_40686 ( "Year" real, "Class" text, "Team" text, "Points" real, "Rank" text, "Wins" real )

### Question ###
What is the sum of Points for 250cc class, ranked 13th, later than 1955?

### Accurate SQL ###

SELECT SUM("Points") FROM table_40686 WHERE "Class" = '250cc' AND "Rank" = '13th' AND "Year" > '1955'