1) I am just about to do some revision on math test for next week.
2) Student need to do revision on english test new week.
3) Student need to start studying their math for the test in next week.
1) I am about to do some revision for next week's math test .
or I have just revised for next week's math test.
2) Students need to revise for next week's English test .
3) Students need to start revising math for next week's test.