Step 7:: Top middle pieces

Now the only thing left is the top middle pieces. This step can be a bit tricky.

This site is more understandable.

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step 6:: Corner flipping

Rotate each corner piece to match its colors. Just like Step Seven(Beginners' Solution).

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step 5:: Rotating Corners

In this stage we will rotate the top corners so they are in the correct position. Each piece’s colors don’t need to be on the right side, the piece just needs to be in the right spot on the cube. This is the same as Step six(Beginners' Solution) with one added step: rotate the top twice at the end instead of just once.

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step 4:: speed solving 2x3x3

We will now continue to 2x3x3 from our 2nd step (2x2x3). Use only 2 of the free cubes. Do not disarrange the 2x2x3.

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step 3:: Correcting Edges

For step 3, we should look for those cubes that are not in their correct edges.
For example, if the red and green piece is turned to the red and green side and the red isn’t with the red side and green isn’t on the green side, then that is an incorrect piece. Now that you have identified the incorrect edges, you need to correct them. This really isn’t that hard because you only have two free layers to move.

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Step 2:: Speed Solving 2x2x3

If you now have a 2x2x2 cube, you can freely move 3 sides of the cube without disarranging the 2x2x2.

Now, you should make the cube to 2x2x3.

refer to the image below.

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step 1::Speed Solving 2x2x2

First step is to make a 2x2x2 square on the corner of the cube.

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