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_12 ( became_acharya_on VARCHAR, name_of_acharya VARCHAR )

### Question ###
When did acharya shree koshalendraprasadji maharaj become acharya?

### Accurate SQL ###

SELECT became_acharya_on FROM table_name_12 WHERE name_of_acharya = "acharya shree koshalendraprasadji maharaj"