This course teaches the Italian the B1 Cittadinanza exam actually asks for, and stops where that exam stops.
The exam is not ordinary B1. Siena publishes a syllabus for it, and that syllabus is shorter than the B1 in a textbook: three indicative tenses, the imperative, the present conditional and the infinitive, in the active and reflexive conjugations. No congiuntivo, no passato remoto, no passive. Nothing in this course models a form the exam does not name.
Work through A1 and A2 of the main Italian course first — that is where every structure the syllabus names is taught — and then this one. You do not need its B1 level before the exam: almost all of that grammar is off-syllabus, and the few points from it that the exam does want are taught here instead. What the main course cannot give you is here too: the vocabulary of the questura, the anagrafe and the permesso di soggiorno, the everyday domains the exam draws on, and a kit for each of the two production tasks.
After your exam, transfer your progress into the main Italian course and carry on at B1 — nothing you learn here is wasted. Do that after the exam, not before: transferring pauses this course, and you will want it until the day you sit.
To be straight about scope: nobody here marks your email or plays the examiner, and these exercises are not in the exam's formats. Siena publishes a full sample paper with the audio, the answer key and the marking criteria, for free. Work through that for the format. This course is for the part underneath it — a few thousand words and a short list of grammar, held in memory rather than revised once and forgotten.