yes. this.
I made the same mistake with my dd. When she was advanced in first grade I simply pushed her on ahead. Then when we hit fourth grade it all hit the fan. It was horrible. Her brain was NOT ready for the concepts, nor was she capable of handling the workload. It was a big mistake. Those advanced courses are designed for the average 6-7 grader not a younger kid.
I'm not saying that you just forget about math and all you have learned, but you may want to consider backing way off.