Mr Bean

Yesterday I watched Mr Bean on TV and I almos forget how funny he is. My favourite part is this when he has a test. I have some tests almost every weekend and propably I get use to passing all of them and it is amusing to see how people behave in that situation. The sections with Mr. Bean are very old but I haven't seen any other guy like him. His countenance, clothes and manner are realy unique.

Your paragraph is fine.  Here is my way.

Yesterday I watched Mr Bean on TV and I almost forgot how funny he was.  My favorite episode is when he's taking a test.  I have tests almost every wekend and I guess I'm  used to passing them, so it's amusing to see how people act in that situation.  The episodes with Mr Bean are very old but I've never seen anybody like him.  His facial expressions, clothes and manner are unique.

In the first sentence you said "how funny he is" and I used "how funny he was."  I think both are common.  I used ''was" to conform to the "sequence of tenses" rules of grammar.
"I watched Mr Bean" (past), so "how funny he was" (past)
If I would use the present, I'd say something like this:  When I watch Mr Bean I'm amazed at how funny he is.

In American English, to take a test is much more common than to have a test.
We refer to individual TV presentations as episodes.

I remember that particular episode.  It was indeed a good one.