Rate of Reaction Hydrochloric Acid and Calcium Carbonate

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  • Topic: Harshad number, General Certificate of Secondary Education, GCE Advanced Level
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Lawrence Sheriff School

Understanding GCSE Exam marks: Year 11 2012-13
Parents and students often ask questions about how different exam marks fit into the whole GCSE. I have attempted to give the picture for all exams taken by Y11s in 2012-13 at LSS. Clearly, you only need to try and understand the subjects that your son studies. I apologise for the daunting nature of this document, but if you look at individual subjects it is not that complicated. GCSEs are divided into different units, which may be assessed by exams or by controlled assessment with not all units having equal weighting. The unit will be marked out of a maximum raw mark. For most subjects, the marks scored nationally are then analysed and the raw mark is converted statistically to a uniform mark scheme (UMS ) mark. This is not a linear conversion but takes into account the difficulty of the paper and the spread of marks obtained nationally to obtain the desired spread of marks. GCSE results are then issued in UMS marks. This allows all GCSEs in all exam seasons to have the same percentage grade boundaries. Each GCSE has a maximum total mark, normally 200, 300 or 400 UMS. This is purely for ease of assessment and a higher total mark does not mean that the GCSE is worth more; a GCSE is a GCSE. Each unit within the GCSE also has a total mark, e.g. a unit worth 25% of a 400 UMS GCSE would have a maximum mark of 100UMS. There are some subjects where a subset of the whole GCSE is also a half GCSE in its own right with its own grade. e.g. either RE unit is a half GCSE in its own right, half GCSEs can also be obtained in French and German in Reading & Writing and Speaking & Listening. However, universities do not count both the full GCSE and a half GCSE contained within it. N.B. The UMS mark is the formally issued result mark. It is derived from the mark scored on the paper (the ‘raw mark’), but the number of marks available on the paper is unlikely to be the same as the maximum UMS mark. The conversion from the raw mark scored on the unit to the UMS mark is determined statistically after the unit has been completed and varies slightly with every subject and exam season to take into account the difficulty of the paper. This means that there are no set raw mark grade boundaries.

Grade Boundaries for Qualifications:
Grade Max mark A* A B C D E % needed 100 90 80 70 60 50 40 Grade boundaries for GCSEs and GCEs with different max marks 200 180 160 140 120 100 80 240 216 192 168 144 120 96 300 270 240 210 180 150 120 400 360 320 280 240 200 160

N.B. For AS any mark over 80% UMS is an A (i.e. no A*). The only exception to this is the Extended Project where an A* is awarded. Other grade boundaries are the same for AS and GCSE.

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Lawrence Sheriff School

Grade boundaries for exams:
Max mark A* A B C D E 40 36 32 28 24 20 16 50 45 40 35 30 25 20 Grade boundaries for units with different max marks 60 70 80 90 100 120 140 150 54 48 42 36 30 24 63 56 49 42 35 28 72 64 56 48 40 32 81 72 63 54 45 36 90 80 70 60 50 40 108 96 84 72 60 48 126 112 98 84 70 56 135 120 105 90 75 60 160 144 128 112 96 80 64 240 216 192 168 144 120 96

GCSE - Marks per unit
Currently, GCSE units can be re-sat once before the end of the course, with the better mark of the 2 attempts counting for the final GCSE grade. Subject Art Board Edexcel 2AD01 Edexcel 2BI01 Total mark 200 Unit details 5AD01 - Controlled Assessment 5AD02 - exam 5BI1H – Influences on Life (B1) 5BI2H – Components of Life (B2) 5BI3H – Using biology (B3) BCA – Biology Controlled Assessment 5CH1H – Chemistry in our World (C1) 5CH2H – Discovering Chemistry (C2) 5CH3H – Chemistry in Action (C3) CCA – Chemistry Controlled Assessment A451 - exam A452 – Investigation Controlled Assessment A452 – Programming Controlled Assessment 45601 – Unit 1: exam 45602 – Unit 2: Controlled Assessment 45401 - Unit 1: exam 45402 - Unit 2 - Controlled Assessment % of GCSE 60 40 25 25 25 25 25 25 25 25 40 30 30 Max UMS 120 80 80 80 80...
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