One of the things that you need to do in the writing test is show that you have a variety of vocabulary to join your ideas.
If you repeat the same word (next, … next, … next, … next) it doesn’t look good. If you use ordinal numbers too much, it looks silly too (firstly, … secondly, … thirdly, … fourthly, … fifthly, … , sixthly, … ). You need to mix the words up a bit. With ordinal numbers, I suggest that firstly, secondly, thirdly is enough. After than you need to change the words around.
There are several steps you need to take when writing a 250 words essay. Firstly, you need to decide what you want to say. Then you need to organise your ideas. Next you should think about your paragraphs. You also need to ensure that you have one main idea per body paragraph. Another important consideration is that you have thought about synonyms for key words. When you have done all of those things, your preparation is done. Finally, you are ready to begin writing.