Whilst schools have set tasks and emergency learning for the parent(s)* they know you are not teachers.
What they are trying to do is give a little bit of structure, take the pressure off everyone during this period. They do not expect you to be great at maths, English or any other subject matter taught.
If you can do an hour of schooling with them, great, perhaps it's in the evening when you've finished your doing your own paid work at home.
This is valuable 'life skills learning' time, use it to your advantage!
Maths is an everyday thing, how many chips have you got on your plate, how many eggs would you like.....
English and other languages spoken are spoken at home, we all learn by listening to how things are pronounced.
Ask the kids to help you cook, bake and learn some basic skills.
Ask them to help with a bit of cleaning, loading the washing machine, vacuuming, dusting etc, takes the pressure off you.
We are in a good internet age, where we have a lot of information at our fingertips, don't worry you are popping them in front of a TV, find some episodes of countdown or other quiz programs, stick their favourite show or film on, for the 50th time.
Remember, you are you. You are not superhuman, don't put yourself under pressure!
*Anyone who looks after kids