Or any other map with stairs. Practicing one or tow maps isn't going to make you better at the transitions between stairs and other patterns, which is also very important.
There's no magical map that you can practice to somehow get better at a given pattern. The key to stairs is to learn to control your finger movements so that you're not just rolling your hand across the keys, but are individually pressing each button. Most people start off by basically mashing stairs, which leads to this problem.
Except zigzag stairs (1234321 or the reverse), stairs are easy if you haven't gotten into a bad habit, at least up until they get extremely fast (once it becomes reasonable to treat stairs as jumptrills).
So is there any tip for me to improve my 4k skill at stairs? 
