@Lisa_Scumpieru The ability to schedule formatives is a great idea that would benefit both Google Classroom and non- Google Classroom teachers.
To clarify, are you scheduling them in Google Classroom the morning you are going to use them because you don’t want students to access them via their Formative dashboards days before? A workaround is to assign the formative in advance so you can grab the link for it and then immediately un-assign it. This will “de-activate” the links while still allowing you to post them.
You can then post the links for the formatives in Google Classroom and schedule them for a given date and time. Then, when it’s time to actually have students take them, you can assign the formative to the desired classes and the link will become “active” again so they are able to take the formative. I know this isn’t ideal but it may make things a little less hectic on the day that you give the formative