Here is the PDF score for this exercise.
In this score you will only see the rhythms and the scale degrees of the melodies for the right hand and the left hand parts.
If the note goes down, there is a sign V next to the scale degree. If the note goes up, there is an inverted V sign next to the scale degree. If the scale degree is repeated, there is a sign = next to the scale degree.
If the scale degree is raised or lowered, there are + and - next to the number respectively.
Here is the order of keys I recommend you practice this piece in:
1. A minor
2. E minor
3. D minor
4. B minor
5. G minor
6. F# minor
7. C minor
8. C# minor
9. F minor
10. G# minor
11. Bb minor
12. D# minor
13. Eb minor
14. A# minor
15. Ab minor
If this exercise seems too complex for you, start with A minor and choose only a few simple keys for practice.
Take a really slow tempo and practice single parts first before playing with both hands together.
Don't worry, if the process is really slow - transposition extremely beneficial for your brain and your fingers alike.
Please let me know how this exercise worked for you.