The curriculum is very easy and repeatedly [I don't understand what you want to say with this word] for the third grade. The children in third grade have knowledge of more things in this book. It's like reviews to them. It's focused of on all four language skills: reading, writing, listening and speaking. The pictures of in this book is are very suitable and clear. I guess the curriculum needs to develop to another level. 

The units [again, I don't understand what this word is used to mean] are too much.