I started my combined science IGCSE in November 2014 and took my exams in May 2015, so essentially I did 2 years worth of learning in 6 months which in itself was hard going, but using the materials from the NEC was really worthwhile. The (extremely large) handbook you get when you enrol has everything you need to learn in it to be able to take the exams, of which there are three. I did get myself a science tutor and in the run up to my exams had a few consolidation sessions where we went through the past papers that are online as preparation, which I would highly recommend if a tutor is in your budget...self teaching does get quite difficult sometimes, even with the help of your NEC tutor via email/phone, sometimes you just need a face to face session with a real person! The exam process was really simple, I took my exams in a NEC partnership school, so everything was sorted out for me and I was just told where to go, what to bring and on what date! Getting results back was also really easy too, as your statement of results will just be emailed out to you on results day! I only needed to retake my science GCSE to enrol on a primary PGCE course, and am super happy to say I got my results 2 days ago and passed, so I begin my teacher training in 3 weeks! There were also lots of other people in the same position as me, so if this is what you need to use the NEC for, I would thoroughly recommend it!!