Your degree classification is calculated using the marks that you are awarded at levels 2 and 3. Level 1 and the study year abroad do not count towards your degree classification.
Modules taken at Level 3 carry twice the weight of those taken at Level 2. Note also that for single honours students, the SEAS dissertation is worth 40 credits and so the mark that you obtain in your dissertation will have a big impact on your final degree classification. The dissertation is also core to your degree so you must pass it in order to graduate.
Please note that in order to graduate you must obtain not fewer than 200 credits at levels 2 and 3, of which not fewer than 90 credits are at F6 (level 3) or above. Please note also that a student who fails the final year and is required to retake failed units in order to graduate should retake all the units failed. A student who fails the final year and is required to pass failed units at re-sit in order to graduate will not be eligible for an Honours Degree. (Please see regulations 4.6 and 4.7 of the Examination Conventions.
For example, if you fail the 40-credit dissertation, you must re-submit it in order to graduate and will not be eligible for an Honours Degree. Similarly, if you fail a level 3 language module in Chinese Studies, Korean Studies or Japanese Studies, you will have to re-sit the exam in order to graduate and will not be eligible for an Honours Degree.
Full details on how your degree classification is calculated are available from the University website.