When I was working as an Assistant Director of studies at an official IELTS test centre I trained up lots of IELTS teachers and worked with IELTS examiners. I organized various sessions and we often discussed IELTS Speaking. These are some great tips and lifehacks we talked over during those days:
When you teach listening in class it is better to focus on one listening section rather than all sections in one class. So, in one class you cover section 1, in the next section 2 etc.
In one class you should cover 1 graph type. For instance, one lesson on a line graph, another lesson on pie charts. Here are the stages you can follow during your writing class (you can change the order of the stages if you wish):