Not having done an ATPL syllabus I wouldn't know.
However, subjects like Met, the ANO, Basic Nav etc will be of the same ilk. As of course will RT Phraseology.
The rest will be new to you. You will have written assessments on the Manual Of Air Traffic Services Part One and practical sim runs. Most of the written assessments require you to answer MATS pt 1 questions verbatim.
Hope this helps. Apart from topics above, just relax for 5 months before your course, and start bright eyed and bushy tailed!!
Most people pass the course without any previous aviation experience so don't worry unduly
Good luck