Performing SQL Update Using Join and Matching Specific Columns

I have a one database with a table containing a column CLASS_LEVEL. I have another database containing a column CLASS_LEVEL as well. In the first table there is only one row for each student, in the second table there are multiple rows for each student, thus multiple CLASS_LEVELS. I need to update the values in TABLE1 with the values from TABLE2. Here is my current code:I have a one database with a table containing a