They provide five standard retouching levels from $1.49 to $9.99 and in two days.
Am not sure if they send it to some developer in India who uses unauthorized photoshop to make it happen. But the services looks good.

Here is the summary from his blog. Read it fully here.

1. First, use a pencil or word processor to type, in complete sentences, any fact you think might appear on the test. Use short sentences because they’re easier to remember.
2. Take your printed notes into a quiet room, shut the door, and eliminate all distractions.
3. Look at the first sentence in your notes and read it out loud. Then, close your eyes and say the sentence without looking at it.
4. Repeat the step above, this time with the first 2 sentences.
5. Next, try it with 3 sentences. Then 4. Repeat until you have memorized every sentence in your notes.

Am sure this will be useful for all students, who finds it hard to memorize.