The channel introduced here is Learn Italian with Annalisa. I have found quite a few tests to evaluate your Italian proficiency.
How to reach an advanced level in Italian?
Again two different points of view: One from Luca Lampariello (three videos) and a second one from Simone Di Punzio. (Lingua Italiana Insieme)
Italiano per tutti
"Italiano per tutti" / Italian for everyone, is the language learning channel introduced here. There are several contributors.
Italiano in 7 minuti
The language channel introduced here is called "Italiano in 7 minuti - Learn Italian with SimoneItaliano in 7 minuti - Learn Italian with Simone".
Piazzasquare Italiano
The language channel I would like to introduce here is called Piazzasquare Italiano, with Carlo as the main contributor:
Metatron Academy
More about the Youtube channel; 'MetatronAcademy' run by Raffaello.
Wheeras his command of Japanese and Chinese made him notorious, it are obviously not the first languages he learnt. Born in Sicily, he spoke Sicilian and Italian from an early age. Note that Sicilian is not an Italian dialect. The languages are not mutually intelligible.
Easy Catalan
The series of related language channels EASY ( ..xxx...) is not limited to major languages and national languages. There is also a channel Easy Catalan.
Easy Dutch
Easy Dutch is a YouTube channel providing access to the videos published by this language learning site.