You do what you feel is necessary for your son. My son had hardly any coaching,but passed his entry exam. I have read lots of post on this forum,and have realized that all children are different. Are you looking to put your son in a grammar school or an independent school?
My son is 11, and is going through the 'Kevin and Perry' stage at the moment. Doesn't want to do any thing...Let alone study! I love Spanish and Latin myself though! He is one of those naturally bright kids that we all knew at school,and it makes me scream,if you know what i mean!
We want the best for our kids, then we feel guilty if we push them too far. Its a competitive world,we need to push them more these days.