Find and correct mistakes in the following sentence (Tìm và sửa lỗi sai):
"I have to admit that i had a struggling period with it when the first time i have had 6.0 at this subject, but soon after that i got interest and motivation to develop it again."
"I have to admit that I had a struggling period with it when the first time I have had 6.0 at this subject, but soon after that, I got interest and motivation to develop it again."