Completely FREE IELTS sample essay . Two versions: Band 9 & Band 5, so that you can compare ans see the differences.
'Smooth' is a one syllable adjective, so it is more common just to add 'er' and write 'smoother'.
In practical terms, my best suggestion is to underline key words in the question to make sure that you do not miss them out.
View this lesson for more advice on writing IELTS essay introductions.