... then you need to practice Octatonic Mode (among 6 others). That's a mode which has 8 pitches with alternating half steps and whole steps. It can only have 3 dispositions - from C, from C#/Db, and D. After that, it repeats itself. Here's a good exercise for starters.
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Drs. Vidas Pinkevicius and Ausra Motuzaite-Pinkeviciene
Organists of Vilnius University , creators of Secrets of Organ Playing.
Don't have an organ at home?
Download paper manuals and pedals, print them out, cut the white spaces, tape the sheets together and you'll be ready to practice anywhere where is a desk and floor. Make sure you have a higher chair.