What is year one , two and three worth at Brunel? I need to workout my average and what I need in year three to achieve a first
Assuming you initially registered at Brunel between September 2019 and August 2023 (which seems likely if you're currently trying to work out what you need to achieve in third year), then the academic regulations which apply to you are given in this document.
For an Honours Bachelors Degrees, the weightings are given in Appendix A as a simple 1/3 : 2/3 split between years 2 and 3:
"A4. For honours bachelors degrees, the weighting of Levels in the profile of grades and grade-point average for the determination of award and classification shall be: • FHEQ Level 4: no weighting; • FHEQ Level 5: 1/3; • FHEQ Level 6: 2/3."