I've taken activities from the following website: Free Online Exam Practice at ExamEnglish.com
You have to write two pieces of writing in 60 minutes.

In Task 1, candidates are presented with a graph, table, chart or diagram and are asked to describe, summarise or explain the information in their own words. They may be asked to describe and explain data, describe the stages of a process, how something works or describe an object or event. This must be at least 150 words.

In Task 2, candidates are asked to write an essay in response to a point of view, argument or problem. This must be at least 250 words.

Responses to Task 1 and Task 2 should be written in a formal style.

Task 1

Here are two activities to help you practise for task 1. You should spend about 20 minutes on Task 1.
The table shows CO2 emissions for different forms of transport in the European Union. The Pie Chart shows the percentage of European Union funds being spent on different forms of transport.
Write a report for a university lecturer describing the information.You should write at least 150 words.

Click on the link to do the activity. Writing Academic IELTS Task 1 European transport

The graphs below give information about commuting inside and outside London in 2009.
Summarise the information by selecting and reporting the main features, and make comparisons where relevant. You should write at least 150 words.

Click on the link to do the activity. Writing Academic IELTS Task 1 Commuting in London

Task 2

Here's an activity to help you practise for task 2. You should spend about 40 minutes on Task 2.

Write about the following topic:
The increase in mobile phone use in recent years has transformed the way we live, communicate and do business. Mobile phones can also be the cause of social or medical problems. What forms do these problems take?

Do you think the advantages outweigh the disadvantages of mobile phones?

Give reasons for your answer and include any relevant examples from your own knowledge or experience.

Write at least 250 words.
Click on the link to do the activity. Writing Academic IELTS Task 2 Mobile phones