as mentioned in other posts, I would mainly work on how you take notes; specifically, my recommendation would be to divide the paper in 4 areas as reported below; when talking notes, you can then put the information in the appropriate box. Sometimes you would have to do back and forth, as you may get information, objective 1, additional information, objective 2, etc.
- top-left: who is the client
- bottom left: initial information
- top right: objectives
- bottom right: structure
After the first page, you could still divide the page in four parts. Left and right could now be at the same distance. Top areas should be smaller to leave more space for the structures:
- top-left: name of the first area analysed
- bottom left: structure for the first area
- top right: name of the second area analysed
- bottom right: structure for the second area
Besides that you should also
- Use abbreviations. Eg, for revenues use R, for costs use C, for increase use an arrow directed up, etc.
- Write down essential information only. You do not have time to write everything, thus you should exercise in writing down only the necessary information. If you have a client which produces steel which has four plants, with a revenue problem, your notes could be something as Steel producer, R (arrow down), 4 plants
Besides this, as already mentioned you can always ask the interviewer to repeat part of the information if needed; once completed your notes you can then provide a synthesis of all the information to verify you wrote down all the essential points.