Hi dear ,

Its easy just stick to the main points no story telling take out major questions and make a rough structure how would you answer questions . Make it a habit of thinking first what would you answer. Headings are most important never mess up with the heading it makes a very good impression when the teachers see  the basic heading laid out well. Well if it's maths be sure to make the steps clear cut don't skip steps and write the formulas first, if you mess up with the answer in the last but if the steps are correct with right formulas then Ull get half of the marks.

Thanks and GOOD LUCK.