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_32 (platform INTEGER, destination VARCHAR, frequency__per_hour_ VARCHAR, operator VARCHAR)

### Question ###
what is the highest platform number when the frequency (per hour) is 4, the operator is london overground and the destination is west croydon?

### Accurate SQL ###

SELECT MAX(platform) FROM table_name_32 WHERE frequency__per_hour_ = 4 AND operator = "london overground" AND destination = "west croydon"