So he spends years studying for/trying to get into an economics degree course, and within the 1st year he finds it 'plain boring'? And now he wishes to study sciences because he want's to be an engineer, and want's to know if it's too late to switch?
1. Is he wanting to switch because he doesn't like economics any more (the excuse about it being 'boring' is a bit lame), or because he's suddenly discovered a passion for science/engineering? A subtle but important difference.
2. If the former, then what made him want to do economics in the first place? Did he check out the course contents before applying?
3. If the latter, then has he investigated the course contents, maybe talked to students and professors on that course, to see what the course involves? Also, surely he should have approached the relevant science department to see if it was possible to switch, whether he has the right qualifications to gain entry to the course, and what must he do, instead of asking on a random internet forum from posters who have no clue about his qualifications thus far?