I have produced some quick easy syllabus checklists for both double award and separate Biology specifications - Edexcel IGCSE 9-1

It's certainly not too early to start thinking about revision for your classes.

It's unlikely that you have finished teaching the syllabus already but if you wait for that it will be too late. 

I'm starting a weekly revision schedule with my IGCSE classes from this week onwards. Each week they will have a quick fire quiz testing the main factual content of the topics required. 

To make it easy I have given them the revision guide references from the CGP revision guide. 

Here is the schedule that I'm using:

Here is the first test that I'm using which you can download for free:

I will aim to post the 'Quick Fire Quizzes' as I make them each week