academic levels uk

If you need to know the level of a qualification, you can:
Qualifications at the same level sometimes cover different amounts of the same subject.

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To achieve a qualification you must gain enough credits at that academic level to pass.
For example to gain an undergraduate (Bachelor’s) degree you would need to successfully complete 120 credits at level 4, 120 credits at level 5 and 120 credits at Level 6.

References:

http://www.gov.uk/what-different-qualification-levels-mean
http://www.goodschoolsguide.co.uk/international/transitions/from-american-schools-to-british
http://profdev.college.police.uk/recognition-prior-experience-learning/information-and-guidance/guidance-for-forces/academic-credits-levels/
http://www.goodschoolsguide.co.uk/international/uk/the-uk-school-system