Ella Dehghani
Google
There is Audio guide for Kremlin, instead of expensive tour guides! You need to pay at the ticket shop Museum office or online, and pick it up from the tour info next door (a bit confusing system).
There are also apps which provide good info.
If you buy tickets online, you still need to show up at ticket office, queue, and pick them up (waste of time).
If you don't buy them online, you need to come to ticket office (my suggestion is earlier than 8:30) to queue . Warning: there are different queue lines for each exhibition, be careful you are not wasting your time, and have multiple people queue in different lines if you are planning to see more than one exhibitions.
I really enjoyed the armoury chamber, then guardians of times exhibitions, and last Diamond fund (in that order).