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_25 ( points_for_higher INTEGER, points_for_foundation VARCHAR, points_for_ordinary VARCHAR, grade VARCHAR )

### Question ###
What average points for highers has 0 has points for ordinary, and Ng as the grade, and less than 0 as points for foundation?

### Accurate SQL ###

SELECT AVG(points_for_higher) FROM table_name_25 WHERE points_for_ordinary = 0 AND grade = "ng" AND points_for_foundation < 0