Your exam technique
Introduce → give an overview → group comparisons → verify numbers and units.
Select the important features
Begin with the subject, measure, and years. Identify the largest change, the highest or lowest category, and any reversal. An overview pulls those patterns together. Organise the detail paragraphs around comparisons instead of describing every figure in isolation.
Keep the report factual
Use past forms for completed past periods and preserve the units. An increase from twenty percent to thirty percent is ten percentage points; it is not a ten percent relative increase. Task 1 reports the supplied information, so avoid giving your own opinion or an unsupported cause.
Avoid this common mistake
An increase from twenty percent to thirty percent is ten percentage points, not a ten percent relative increase. Preserve units and do not invent a cause for the pattern.
See it in practice
Starting point
There were 30, then 20. Another number was 20 and then 35.
Using this skill
Car travel fell from 30% to 20%, while cycling rose from 20% to 35% and became the leading mode.
The comparison names the categories, keeps the units, and highlights a change in rank.