In an exam situation take at least five minutes at the start to plan and five minutes at the end to check your work.
Jane Eyre: AS & A2
Make sure that you use these key words regularly in your answer to maintain focus.
Integrate quotations into the sentence – Jane’s sense of humour is shown when she comments, ‘much good may it do you!’ on hearing Eliza’s plans to become a nun.
Check you have made at least two comments each on: language, context, different interpretations and other texts that relate to "Jane Eyre", as relevant.
Take a breath, read through what you have written and think, before you continue to write. Examiners are looking for quality above quantity.