You said that your S1 is “in over his head in every single subject…”, please note that it is very common for college freshmen to get their first-ever C or lower grade in the first term. Your older son’s confidence might have been shaken a little, but please remind him to keep at it with a positive can-do attitude, use the resources at school, and do recognize that he is not the only one who is (feels) “in over his head” at school.