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Key areas for revision for a C grade – Links below to videos:

Use of a calculator   http://corbettmaths.com/2013/02/15/use-of-a-calculator/

Compound interest  http://corbettmaths.com/2012/08/21/compound-interest/

What percentage  http://corbettmaths.com/2012/08/21/expressing-one-quantity-as-a-percentage-of-another/

Angles in Parallel Lines   http://corbettmaths.com/2013/04/04/parallel-lines-angles/

Bearings  http://corbettmaths.com/2013/03/27/bearings/

Pythagoras  http://corbettmaths.com/2012/08/19/pythagoras-video/

Area of a circle   http://corbettmaths.com/2013/12/22/area-of-a-circle-video-40-and-59/

Circumference of a circle  http://corbettmaths.com/2013/12/21/circumference-video-60/

Reflections describing  http://corbettmaths.com/2013/06/23/describing-reflections/

Translations   http://corbettmaths.com/2012/08/10/transformations-translations/

Volume of a prism  http://corbettmaths.com/2013/03/24/volume-of-an-l-shape-prism/

Speed, distance, time  http://corbettmaths.com/2016/01/01/speed-distance-time/

Mean from grouped data  http://corbettmaths.com/2012/08/19/estimated-means-from-grouped-data/

Forming equations  http://corbettmaths.com/2013/04/20/forming-and-solving-equations/

Trial and improvement  http://corbettmaths.com/2013/04/04/trial-and-improvement/

nth term  http://corbettmaths.com/2012/08/20/the-nth-term-for-linear-sequences/

Questionnaires  http://corbettmaths.com/2013/06/23/questionnaires/

Frequency polygons  http://corbettmaths.com/2012/08/23/frequency-polygons-2/

Cumulative frequency  http://corbettmaths.com/2012/08/09/drawing-cumulative-frequency-graphs/