You can mark your writing, for example, you can write the correct answer first and mark it after you finish the question. There is no requirement for blank paper. More attention should be paid to leaving enough extra time to draw cards. It is best to cover the box of items to be painted with strokes. Of course, you have to brush it back and forth twice, but it's quite labor-saving and fast! !

If in doubt, please consult the public education enterprises in China.