Hello,

Embryology is a part of biology. It's a very tough subject. So you have to study a lots and proper as well. Embryology mainly including fertilization, prentalal development of gametes. So you have to study so many diagrams also. Vishram Singh book have so many diagrams than IB Singh, so you can prefer Vishram Singh book. Infact IB Singh book have some theoritical errors which you can find Vishram Singh book. You can go for some other books like Lagman embryology, Bars embryology etc.

All the best .