I get ur point but to my personal opinion, a child should do all the 15 subjects in Form 1 and Form 2 as it not only increases their options of field of study but also, it widens their mind and increases their knowledge on the subject. And the workload is actually quite small as compared to higher levels for in these lower level classes, they do practically just the basics so at least everyone from any field knows the basics of any field and can use that knowledge to determine his/her passion.