what level of education is a level

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

If you are on a personal connection, like at home, you can run an anti-virus scan on your device to make sure it is not infected with malware.
If you are at an office or shared network, you can ask the network administrator to run a scan across the network looking for misconfigured or infected devices.

References:

http://www.goodschoolsguide.co.uk/international/transitions/from-american-schools-to-british
http://www.ucas.com/undergraduate/what-and-where-study/studying-uk-college