Thank you, PettswoodFiona and bluesea. Her weak areas seem random. She seemed to have a problem with NVR code questions in Feb and got all the code questions right in May. On the other hand, she was fine with sequence before but didn't do well in May. Having said that, it's hard to compare as the difference could just be only one or two questions.
She is very bright and has been always on the top table at a high achieving school in the borough where many children have tutors from Y2 and I believe she would thrive in a school like NW. I think it would be a shame if my DD misses out just because I cannot afford to provide the support most other parents in her school do such as getting a tutor/tutors (one of her best friends has three tutors for different subjects!

) or sending them to a tutoring centre or kumon, etc. I am a single mother and works full-time. So, it's difficult to sit with her. I feel like I am a lousy parent...