I assume by matrices you mean the three by three squares with one missing and you have to choose from the answers which one fits best, if that makes sense, I tried to cut and paste an example but failed.
In my opinion yes you could expect these to come up on an NFER type paper, I am pretty sure they are in the pack of four NFER that you can buy.
These are about as hard as it got for us last year, I think the solution is not to try and "see" the answer but break the problem down into its different levels. There is an element of brain training, try a few examples, leave for a few days, repeat the same examples followed by a few new ones. You may be surprised that it clicks. There are some threads from last year on NVR is bad for your health.