First of all, hello! This forum looks really nice and im glad that i have joined:)

I need some informations about which grade are some pieces, that im playing:

Beethoven sonata op.79 mvts 1,2 and 3
Bach: Gigue from French suite 6
Chopin: Etude op.10 no.3 , Marche funebre (from sonata) and op.27 no.1

Thanks for help.

What do you want to know?

I think (s)he wants to know what grade the above pieces are

As i already said, i want to know which grade are those pieces.

Well, the Beethoven Sonata Op79 is Grade 7-8 (probably Grade 8 to play well at correct speed)
The other two movements are easier, the slow movement about Grade 5. I played the last movement for Grade 6 (LCM) in about 1960 ! Its probably still that. Great for practising '3 against 4'.

The Bach and Chopin are certainly Grade 8 ish.

Thanks. Is LCM easier, harder or equal to ABRSM?

They have the same level of accreditation.
What some people find hard others may find easy... or a least easier.