Hola Isaiah

Yes, Kwiziq has an extensive programme with grammar from A0 to C1, so you can use Kwiziq as your core resource for your grammar and practice, as we also have lots of different exercises that will help you solidify that grammar that you learn while doing tests. 

You can also ask any doubt you have related to grammar and vocabulary here in the Forum to clarify anything that is not that clear. 

Un saludo cordial