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Hi Maha,
The main thing to note is that you need to collect X2 blocks
Make sure you use your paint as much as you can to create these.
Also, don't waste moves by collecting the X2 blocks each time you paint, but try to make a larger group of them to get each time.
You'll see in the example (above) that I tended to concentrate on collecting X2 blocks one color at a time.
I hope these tips help. Good luck 🙂