Yesterday I suggested some good ways to prepare for writing task 2, instead of just writing full essays. Here are some study ideas for task 1:
1) Print a collection of questions
Before you start writing any task 1 essays, it's a good idea to have an overview of the different types of questions that you might face. Try to get paper copies (printed) of around 10 different questions - it's useful to be able to see them all in one place. Your 'pack' of questions should include: a line graph, bar chart, pie chart, table, 2 different charts, 3 or more similar charts, process diagram, comparison diagram, life cycle, map.
2) Practise parts of essays
Instead of writing a full essay, try writing 10 introductions - one for each of the questions in your 'pack' (see point 1 above). The next time you are studying, just focus on writing overviews. On a different day, practise describing percentages, or comparing numbers etc...
3) Use 'model' sentences
In last week's lesson I showed you some model sentences for describing percentages. If you look through my task 1 essays in the lessons on this site, you'll find all the sentence structures you need for the 10 question types mentioned in point 1. Use my sentences as models, and simply change the content according to the topic.