Any behavioral techniques that work well for children with autism and adhd?

I am wondering what works for others as far as behavior strategies, systems, plans etc. My son is six years old with several diagnoses including adhd, bipolar, and high functioning autism. His behavior is a major issue. We have tried time outs, reward systems where he got stickers and then a reward at the end of the week or day, 123 magic, and more with no success. Any ideas?

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