But thats one track. Say you went carpenter route when you were 15 and now you want to study medicine or electronics or CS. You are going to lack basic backgrou

But thats one track. Say you went carpenter route when you were 15 and now you want to study medicine or electronics or CS. You are going to lack basic background: even with master school it is really going to be tough to learn all the chemistry, mathematics, biology or physics that is required for those majors.