I understand the lost year! Nothing against my son's teachers but I feel that K, 1st were both lost years for my DS9. Mid 1st grade year I just had enough of it and really just didn't want him to become lazy and not care. After 4 months of back and forth we were able to get him accelerated to 3rd grade math the beginning of his 2nd grade year. Then another change the following year. We accelerated him to 4th grade. So he skipped 3rd grade (except he had really had 3rd grade math). I can tell you that our principle was so opposed to it. She couldn't even look at the positives to it. After testing and so much back and forth and finally appealing the decision to the superintendent they decided to let him do it. 1/2 way through the year of 4th grade and it has been AWESOME!! He likes it, it is going well, frields are going well. Couldn't be happier. However, it was 3 months of very stressful back and forth with the principle and a couple other key people. I wish I could say that since this has gone so well the principle will be open to it the next time. But I believe she will never be. It's really unfortunate but somehow in the end it worked out.
Good luck! Acceleration isn't for everyone but after you do the research, you know your child the best! Fight for what will be best for them.
If you haven't read Nation Deceived yet please check it out it is a great book and helped me make some decisions.