Grade boundaries transform the number of marks into grades on a scale of 1-7. To determine the final grade, marks are scaled to percentages. 4 is considered passing. The HL Essay counts toward 20% of the final grade. (paper 1 = 35% , paper 2 = 25%, IO = 20%) There are 20 marks available. The following grade boundaries are not official IB grade boundaries; however, they give an indication of what the boundaries could look like next year.