what are the levels of education in uk

Most qualifications have a difficulty level. The higher the level, the more difficult the qualification is.
Qualifications at the same level sometimes cover different amounts of the same subject.

T Levels include a 45-day industry placement that can help you find and develop new talent.
T Levels are an alternative to A levels, apprenticeships and other 16 to 19 courses. Equivalent to 3 A levels, a T Level focuses on vocational skills and can help students into skilled employment, higher study or apprenticeships.

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References:

http://www.tlevels.gov.uk/
http://www.goodschoolsguide.co.uk/
http://www.london.gov.uk/what-we-do/education-and-youth