Will my child be at par with children in a conventional school?

No. Child will be at par with themself, with what and who he or she is :). Why compare?
If you are keen on comparing, you will realize that the child would be better or know much more in one area while would not have knowledge or skills as compared to others in another area. This is incidentally even with children who have all studied the same subjects – we all are just naturally inclined to be strong in some areas and weaker in others, based on our time and interest.