If your FI certificate (it's no longer a rating in EASA-speak) has expired, you need to (a) undertake an Assessment of Competence (test) with an FIE after having completed an unspecified amount of refresher training at an ATO, and (b) attend an FI Referesher Seminar. You obviously cannot rely on the third option which would be available and apply if you were revalidating your certificate, namely 50 hours of flight instruction during the period of validity.
There is no pre-course work or specific pre-requisites to attending a refresher seminar; we had one chap (an airline pilot) on our seminar last week who was renewing his FI cert after 29 years out. It's not a pass/fail event - in essence your attendance is one half of the renewal process. The Q&As you refer to are nothing to do with the seminar - they form part of the 'Theoretical Knowledge Oral' element of the Assessment of Competence (test), comprising the long brief lecture and separate questions. The seminar is essentially a platform to bring everyone (current or otherwise) up to speed with some of the recent changes under EASA and ad-hoc sessions covering anything from learning styles, avoiding airspeed infringments, first solo considerations and more besides. It doesn't prepare you for the Q&As or the test as a whole.
For more info on the renewal requirements, EASA Part-FCL Subpart J, associated GM and AMC (notably FCL 920, 930, 935 and 940) refers. Also CAP804 Section 4 Part J (Instructors) and the CAA Standards Document 10.
Appendix 5 of the Standards Doc contains the Question Bank for the theoretical knowledge elements of the Asessment of Competence, some 250 questions (incl some ME and Aerobatics questions)!! NB the answers aren't included!!
HW