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Unless they specifically ask for a particular structure diagram, any correct representation of the structure will be accepted.

Use theses chemguide links, has everything you need for A2 level. They also say what topics come more often in the exams, so focus on them. Chemistry of Life Applications of analytical Chemistry Design and materials Read the Application Booklet, and the course book too.

You are not alone. The best thing you could do right now is practice the past papers, and take help from tutors when you face problems.

There's only 1 tertiary H, and there are 9 primary H's. The probability of the Cl replacing the tertiary H, i.e. probability of J forming, is 21 (because 1 * 21), and the probability of Cl replacing one of the primary H's, i.e. probability of K forming, is 9 (because 9 * 1). Therefore, the...

I would like to point out that the question was about 'differences in population PROBLEMS', not just 'population'. :)