A checkbox field stores a serialized array in the DB.
// to search for one of 2 values
<code>meta_query</code> => array(
'relation' => 'OR',
array(
'key' => 'drptest',
'value' => 'Educational',
'compare' => 'LIKE'
),
array(
'key' => 'drptest',
'value' => 'some other value',
'compare' => 'LIKE'
)
)