What Score Do You Need on the Final Exam to Hit Your Target Average?

When the final exam is the last piece of your grade, the question that matters is simple: what score do you need? You can answer it with a little algebra. Sometimes the answer is reassuring, and sometimes it is a reality check, but either way it is better to know than to guess.

The method depends on whether every assessment counts equally or carries a different weight, so here are both cases.

Case 1: every test counts equally

Suppose you have three test scores of 72, 68 and 80, a fourth test still to come, and a target average of 75 across all four.

1. Work out the total you need: 75 × 4 = 300.
2. Add up what you already have: 72 + 68 + 80 = 220.
3. Subtract: 300 – 220 = 80.

You need 80 on the last test. The general rule is that the score you need equals your target multiplied by the number of tests, minus the total you have so far.

Case 2: the final carries more weight

Most courses are not that simple. Say your coursework is worth 60% of the grade, with an average of 74, and the final exam is worth the remaining 40%. Your target is 80 overall.

Your coursework already contributes 74 × 0.60 = 44.4 points. You need 80 – 44.4 = 35.6 more, and the final supplies only 40% of the total, so divide: 35.6 ÷ 0.40 = 89.

So you need 89 on the final. In words: the needed score equals the target, minus coursework average times coursework weight, all divided by the final’s weight.

Before you use the formula, calculate average coursework marks carefully. The whole answer depends on that one figure, and a small slip in it carries straight through.

When some coursework is still unmarked

Sometimes not everything has been graded yet. In that case, use only the marked work and its share of the grade. If assignments worth 45% of the course have been marked, with an average of 74, they have earned 74 × 0.45 = 33.3 points so far. Your target of 80 still needs 46.7 more, which must come from the remaining 55% of the course. Divide 46.7 by 0.55 and you need roughly 84.9 across everything left. It is a rougher estimate than the exam-only version, but it still tells you whether you are on track.

What different targets require

Using the same coursework average of 74 and the same 60/40 split, the final exam score you need changes quickly as the target rises:

The 85 row matters. When the required score is above 100, the target is out of reach unless your course offers extra credit. You can still work out the best case: a perfect 100 gives 44.4 + 40 = 84.4 overall.

Is the target realistic?

Compare the required score with your recent results. Needing 64 when you have been scoring in the 70s is comfortable. Needing 89 when your best test was 80 deserves a plan, not just hope.

It also helps to check the other direction. If you scored zero on the final, your grade would be the 44.4 your coursework earned. Knowing both ends of the range shows you how much of your result is already decided.

Turn the number into a revision plan

A target score is only useful if it shapes how you spend your time. Count the days you have left first. Counting from 19 October to an exam on 14 November, a day counter will confirm 26 days, which is easy to get wrong when the dates span two months.

Now divide the time. Take away four rest days and you have 22 study days. If the syllabus has 11 topics, that is two days per topic, with no slack. If you want a buffer, plan to finish topics early and keep the last few days for past papers.

Small costs add up

Revision materials can be a real expense. If you buy a $60 guide through a shopping site that offers 5% back, a cash back calculator would show $3 returned, a small reduction in the net cost, assuming the offer applies and the payout is confirmed.

Common slips to avoid

• Ignoring the weights. A plain average of your marks and the final will not match your real grade.
• Mixing points and percentages. If some tasks are scored out of different totals, convert them before combining.
• Forgetting grade boundaries. A target of 80 might mean 79.5 rounds up, or it might not. Check how your course rounds.
• Treating the result as a promise. The calculation tells you what you need, not what you will get.

Final thoughts

Working backwards from a target takes two lines of arithmetic. Find what your coursework has already earned, subtract it from your goal, and divide by the final’s weight. Then check whether the answer is possible, and turn it into a day-by-day plan.