Looking for some more practice

I was going through the tests that are shared with us on the moodle.
I need some more exercises to practice the theory you teach us. The projects are nice but it’s not enough for me.
I was looking at Guy Even’s DLS book but most of the questions there are without answers. Are there any answers for them?
Moreover, where can I practice more on building combinational circuits? With answers of course.
Thanks in advance.

Can someone answer me please?