Is there a way to target specific reviews?

You’ll need to make use of the Item Inspector script and the Self Study Quiz script (which Item Inspector works with). This allows you to make tables of items and then quiz yourself on what’s in that table. More information about using and installing scripts can be found linked in those threads.

There’s no way to do something like “only meanings” or “only readings” as far as I’m aware; reviews are always reading-meaning question pairs. Edit: as rfindley pointed out, Self Study Quiz actually has settings for which question types you get, so you can indeed quiz on only meanings or readings.