Some points to keep in mind

You might be surprised that some grammatical topics which we usually stress as important do not have a separate category on the index page.

This does not mean, there are no exercises on that topic, it is integrated into other categories. There are, for example, quite a lot of exercises to practice Relative Clauses, but they come up in the context of attributes, passive and conjunctions (i.e. subordinate clauses).

Also, when you do the exercises under a particular heading, you will have to deal with complete sentences which integrates this aspect of grammar but also contains a lot of other grammatical aspects. You will have to pick out ALL the mistakes in that sentence - even if they don't belong to the topic you are practicing.

The reason for this is that after having covered most of the grammar topics at this stage, you have to learn now how to look at all of them together and in context....don't worry, you will get used to it, even if it can be frustrating and irritating at first. :-)