Sorry for misunderstand, I got confused.
The user will fill the form which is on the right side which is working fine
ON checklist side, the user should at least choose one course either on the first column or second column. When the user choose one course on the first column and then submit. It will not submit and it shows the message that Please make a correction below.(there is something related to the second column)
Therefore, I need a php code if a user choose only first column then it submit without giving message
Thank you