Well, Whiplash proposed a method of study which I feel is the best way to improve upon a specific topic. The system is as follows:
1. Familiarity -
The aim here is conceptual clarity. Learn all the formula and theory involved in a particular topic.
2. Strategy -
Once you're familiar with the concepts, you can start solving problems from various sources to apply the concepts learned in the previous step. The aim here is to improve the accuracy by understanding each and every step that leads to the answer and by finding novel approaches to solve similar types of problems more efficiently. Speed can wait.
3. Practice -
In this stage, the main aim is to work on timing. See if you're able to solve problems under two minutes.
4. Test -
Check if you've reached the stage of proficiency you desired.
I hope this helps...
I gave my GMAT yesterday and I had just one question from Permutation and Combination.
Overall, the topic wise distribution of questions was even. However, questions from Numbers, Geometry, Inequalities and Modulus, and speed-time-distance were more frequent.
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From 650 to 710 to 750 - My Tryst With GMAT [Experience Thread]