How much revising do you do with a class 2 child before the half-yearlies?

Our elder daughter's half-yearly exams start after the Ganesh holidays. There's a timetable, a syllabus sheet with page numbers, and a note asking parents to "ensure adequate preparation". Last year in class 1 it was all worksheets done in class and we heard nothing till the report card. Now I don't know whether to sit with her every evening for a week or let the school handle it and see what comes back. The 2 year old will want to "study" too, whichever way we go.