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_18 (season VARCHAR, points VARCHAR, finish VARCHAR)

### Question ###
What season has a 6th north finish and more than 21 points?

### Accurate SQL ###

SELECT season FROM table_name_18 WHERE points > 21 AND finish = "6th north"