Assuming you're on a 3 year degree and your classification is 25% second year, 75% third year:
- Find out the weightings of your second year modules.
- Calculate a weighted average for your second year
- Multiply the weighted average for second year by 25% to get the percentage of your degree that you've already earned.
Or, if you want to give me the info I'll calculate it for you.
*obviously the numbers change based on your uni, but it's just an example