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  2. A-level (United Kingdom) - Wikipedia

    en.wikipedia.org/wiki/A-level_(United_Kingdom)

    The O grade was equivalent to a GCE Ordinary Level pass which indicated a performance equivalent to the lowest pass grade at Ordinary Level.. Over time, the validity of this system was questioned because, rather than reflecting a standard, norm referencing simply maintained a specific proportion of candidates at each grade, which in small cohorts was subject to statistical fluctuations in ...

  3. AQA - Wikipedia

    en.wikipedia.org/wiki/AQA

    AQA Education, [1] trading as AQA (formerly the Assessment and Qualifications Alliance), is an awarding body in England, Wales and Northern Ireland. It compiles specifications and holds examinations in various subjects at GCSE, AS and A Level and offers vocational qualifications. AQA is a registered charity and independent of the government.

  4. Oxford, Cambridge and RSA Examinations - Wikipedia

    en.wikipedia.org/wiki/Oxford,_Cambridge_and_RSA...

    Oxford, Cambridge and RSA Examinations [2] (OCR) is an examination board which sets examinations and awards qualifications (including GCSEs and A-levels).It is one of England, Wales and Northern Ireland's five main examination boards.

  5. International General Certificate of Secondary Education

    en.wikipedia.org/wiki/International_General...

    The IGCSE prepares students for further academic study, including progression to A Level and BTEC Level 3 study, LRN Pre-U, IB Diploma Programme and other equivalents. It is recognised by academic institutions and employers around the world and is considered by many institutions as equivalent to the standard GCSE.

  6. Metallic bonding - Wikipedia

    en.wikipedia.org/wiki/Metallic_bonding

    Metallic bonding is a type of chemical bonding that arises from the electrostatic attractive force between conduction electrons (in the form of an electron cloud of delocalized electrons) and positively charged metal ions.

  7. Exam - Wikipedia

    en.wikipedia.org/wiki/Exam

    This is an accepted version of this page This is the latest accepted revision, reviewed on 13 January 2025. Educational assessment For other uses, see Exam (disambiguation) and Examination (disambiguation). Cambodian students taking an exam in order to apply for the Don Bosco Technical School of Sihanoukville in 2008 American students in a computer fundamentals class taking an online test in ...

  8. Cahn–Ingold–Prelog priority rules - Wikipedia

    en.wikipedia.org/wiki/Cahn–Ingold–Prelog...

    The spiro carbon, C, is a stereogenic centre, and priority can be assigned a>a′>b>b′, in which one ring (both give the same answer) contains atoms a and b adjacent to the spiro carbon, and the other contains a′ and b′. The configuration at C may then be assigned as for any other stereocentre.

  9. Error Carried Forward - Wikipedia

    en.wikipedia.org/wiki/Error_Carried_Forward

    That is, if a student answer's "x" for part a, the correct answer to part b is "f(x)." No matter what the student puts for part a, the corresponding answer for part b can be calculated quickly. Lawson-Perfect discloses that this system cannot identify "why" a student made an error, but maintains that it is generally successful in providing fair ...