After taking Mocks, analyse all the wrong answers. Check if it was wrong due to conceptual failure or due to silly mistake. If you didn't get the concept right, you know what you have to do. If the answer was wrong due to "silly" mistake, list it down in a dairy and maintain the dairy. After some time you will be surprised to notice that 80 % of the silly mistakes are of the same kind and that you have been committing the same silly mistake so often.
When I was teaching a student some time back, he used to always make the following mistake :
2% of 10 = 5 ( use to divide 10 by 2)
3% of 20 = 6.66
4% of 20 = 5
He had been doing it for long but never took notice of it. Though he very well knew that 2% of 10 is not 5 but whenever he was in a hurry or under pressure he used to commit this error. It was costing him a lot which he never realised. After I noticed him doing it a few times, we discussed about it and from then onward he used to take particular care while solving these problems. The point is , if you know the areas where you are vulnerable of committing silly mistake you must be extra careful and for that you must first know the areas where you are likely to commit a silly mistake.
To improve on Speed :
Don't worry too much about speed now, do it at your natural rate. Speed will improve with improvement is accuracy.
Try to improve on accuracy by avoiding silly mistakes.
Speed of reading or solving problems cannot be changed overnight and you will compromise on accuracy if you try to speed through the paper, but accuracy can be improved by taking a little bit extra care without investing any extra time.
A silly error prevented from occurring will give you the same result as increasing the speed.
A few seconds here and there can be saved by memorising short cuts, memorising tables till 25, square and cubes till 30, Pythagoras triplets, and other commonly used calculations.
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