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 endowment (school_id VARCHAR, amount INTEGER)

### Question ###
Find the number of schools that have more than one donator whose donation amount is less than 8.5.

### Accurate SQL ###

SELECT COUNT(*) FROM (SELECT * FROM endowment WHERE amount > 8.5 GROUP BY school_id HAVING COUNT(*) > 1)