First board: If you can do so, firstly use the rocket in the top right corner, and afterwards the rocket in the top left corner. That way you can proceed to next board in just two moves.
Second board: Ignore the gold-striped blocks in the top part. Focus on getting the flow of water to the exit as fast as possible.
Third board: Gold-striped blocks on the left side could help. Spend a move or two there, if you have some big combos to match. Focus on the right straight afterwards, and get to the exit as soon as possible.
Fourth board: Gold-striped blocks on the bottom could help now. Spend a move or two there, if you have some combo to match. Then focus on getting to the exit, match big combos and combos that bring the flow of water to the exit. Plan. You could use your Color Burst from Magic Orb here, but it's better to save it for next board.
Fifth board: Use the rocket in the bottom right corner and also the one in the top right corner, if you can. After you've done so, use the Color Burst on the diamond that's on the tile just beside the exit. Break some of the remaining ground blocks so that you can proceed to sixth board.
Sixth board: If you can use given Color Burst, that's great! Use it. If not, don't worry. Focus on gold-striped blocks in the top left part you have here. Keep in mind that they give a lot of points - 2,000 points each. It's possible that you finish your way here - with destroying those gold-striped blocks, you should reach 33,000 points. If there are no gold-striped blocks left and you haven't reached the target, you can try to break some blocks and get the water to the exit and therefore proceed to Treasure Room, which also gives a lot of points.
Seventh board: A treasure room with three colors. Matching big gems will hopefully give the remaining points.