The same level and grades
Pearson designs its International GCSE to the same standard as its GCSE and grades both 9 to 1. UCAS says students can expect universities to accept International GCSE grades as equivalent, grade for grade, and notes they are used in place of GCSEs in more than 350 UK independent schools.
Check before you enrol
International GCSEs are not regulated by Ofqual. If a course or an employer needs your grade, ask them to confirm they accept International GCSE before you start.
How long a subject takes
UCAS puts one International GCSE subject at about 120 guided learning hours. Use that to judge whether November or the summer series gives you enough time.