For some maths calculations.
You can write in the test booklet.
Nope, you do your work in the booklet. You could ask your proctor if you could use a seperate sheet of paper but a strict proctor may say no.
^I don’t think proctors are allowed to give extra scratch paper, in order to preserve fairness between test-takers.
And is there enough space in the booklet?
@barborazel There is more than plenty of space in the booklet. Do not worry about space on the test.