Unit 10: Be going to

 You can practice the future with going to here (there are 3 exercises):

https://test-english.com/grammar-points/a1/be-going-to-plans-predictions/3/

More links:

https://agendaweb.org/exercises/verbs/future/going-to-forms

https://agendaweb.org/exercises/verbs/going-to-match

https://agendaweb.org/exercises/verbs/going-to-write-2

https://agendaweb.org/exercises/verbs/future/going-to-interrogative-forms

https://agendaweb.org/exercises/verbs/going-to-write-3

https://agendaweb.org/exercises/verbs/going-to-questions-2

And here you can practice using the future with will, or with going to (also 3 exercises here):

https://test-english.com/grammar-points/a2/will-vs-be-going-to/