Usually the difficulty for these questions isn't so much complex patterns, but because of the nature of grid questions being either moving across a plane (like this problem), up or down columns, even each of the 5 combining to form a large image, you are required to both work that out and also find the pattern. For that reason I think you will be fine knowing the basic ones, e.g. 1 movement in one direction + two in another, or 1*3, 1*4, 2*2, probably not much more than that.
It may also be something like one up, one across, alternating, or one up, two across alternating , etc..
I wouldn't expect many of this specific type of question, maybe one or two tops. You can use other patterns you are in different types of questions here too.
If you are struggling to find the answer quickly, write in the positions of bcde superimposed onto the grid of a. That way you can easily try and form patterns instead of glancing across the whole lot which is quite confusing at first