Please see the my AAA update which can be downloaded from here https://opentuition.com/acca/changes-from-june-2020-to-september-2020-acca-exams and note the last paragraph re past exam questions. I wouldn’t know if a new kit has new questions (other than more inclusion of more recent exam questions which are available on ACCA’s website) but certainly those questions which are affected by changes in examinable documents (not only changes in syllabus) should be updated by an Approved content provider. It is up to you whether you consider these changes sufficient to merit reinvestment in a new kit.