A loose essay structure is a good plan to help you start an exam question, but shouldn't be something which is set in stone. For example, it is a good idea to begin with a brief introduction and is important to end with a solid conclusion. The bulk of your essay may change according to the question; you may decide to chunk all paragraphs for and all for against or crossover, playing each point against the other - either can be successful. Alternatively, a theory question (such as evaluate Marxist views of the family) may require 4 separate paragraphs, each for the key theories.
Another tip may be including a real-world example, to help illustrate your understanding. For example, in an essay evaluating the disappearance of childhood, you could mention child migrants in your against side or the outrage at child abuse scandals (Rotherham) might also support a loss of innocence. This can be easy, but help make your answer sophisticated and impresses the examiner - it helps show you've understood the concepts. This can easily be included by staying up-to-date with current affairs.