Hello.

If your daughter was unable to go through her 10th course work properly and feels it would be better for her to repeat the same class again, then imthere is no harm in doing so. If your concern is about her age, then she is at the perfect age to be in 19 th std. She might even be too young for her class.

I hope I understood your query properly. But if you find the answer is not what you were looking for please update your query and mention what exactly you want to know.