It is important that East wins all the aces in West's hand; so no matter what the opponents lead, West should win it, with an ace.

There are four losers: a club, a diamond, and possibly two hearts.

Win with the ace of spades in West. East ruffs the 2 of spades, and returns to the remaining ace in West.

Seeing that the king and jack of spades are played, the 10 of spades is a winner. Play it to be ruffed by South, and discard the remaining diamond loser in West. One trick down.

Only a club and a heart can be lost. Draw the Ace and Jack of hearts with the king and queen.

Three tricks down, and the contract is made.

South has a 4 loser hand and !NT is likely to be an 8 loser hand; therefore, with 10 losers (18-12 = 6 overtricks), a slam is possible.

So, South should bid 4C, which is Gerber asking for aces.

North responds 2H, showing 2 aces.

South then bids 6H and makes the slam.

  E         S         W         N
 -            -          -         pass
pass    pass    2NT*    pass
4C*     pass    5C**     pass
6NT    pass    pass     pass

*  = Gerber
** = 4 Aces

A small slam for E/W, although the declarer will actuall make all 13 tricks!

Vulnerable NT
Vulnerable 3NT + 4
40+6(30)+500=720 points to E/W
But if bid a small slam 6NT + 1 an extra 500=1220 points (note if only 6 tricks = 1190)

However, to disrupt the contract
  E         S         W         N
 -            -          -         pass
pass    pass    2NT*     3D#
4C*     5D##    pass     pass
pass

#  = Disrupting the likely slam
## = Believing partner's hand was stronger than it actually was

If N/S bid 5D non-vulnerable doubled going down 4
Minus 100+200+200+300=800 points to E/W

This is a Psyche, which is perfectly legal (although illegal in some systems and tournaments), but a deliberate and gross mis-statement of honour strength and/or suit length. It is primarily to mislead or disrupt the opponents. It must be declared in the player's system card.
Systemic psyching is not permitted, i.e. the player's partner knows what it means! A Deviation or Psyche should be just as much a surprise for the bidder's partner as it is for their opponents.

Typical Bidding for 4H:
 N            E            S           W
  -             -            1C          pass
 2H          2S          3H         pass
 4H         pass       pass       pass

Surprisingly, it is not always best to lead a singleton.
If East leads the Jack of Clubs, North will make the contract with 620 match points.
East should have led the King of Spades, and the contract will go down one trick losing 100 match points.

Compare below.

Tricks with singleton lead:                                            Tricks with king of spades lead: 

1.            CJ            C3           C2           CK                           1.            SK           SA           S3           S6

2.            H2           H3           HA          H4                           2.            H5           H4           HK          H3

3.            H5           H8           HK          H7                           3.            HQ          H7           H9           H8

4.            HQ          HT           H9           S3                           4.            CK           CJ            C3           C2

5.            C4           S4           CA          CT                            5.            H2           HT           HA          S8

6.            D7           D2           DK          DA                          6.            CA          CT           C4           D3

7.            D6           D8           DJ           DQ                          7.            C6           CQ          C5           S4

8.            DT           D3           S7           D4                           8.            ST           S2           S5           S7

9.            S2           SK           SA           S8                            9.            S9           H6           SJ            C7

10.          C6           CQ          C5           S5                           10.          DQ          DA          D7           D2

11.          ST           S6           SQ          C7                           11.          SQ          C8           D4           HJ

12.          SJ            C8           S9           H6                           12.          DK          D5           D8           D9

13.          HJ           D5           C9           D9                           13.          DT           D6           C9           DJ

Actually 7 Diamonds, 7 Hearts, and 7NT could be made!

Bidding for 7D:
 W         N           E         S
pass    1D        pass     1H
pass    3D        pass     4NT*
pass    5S**     pass     5NT*

pass     6D       pass     pass

pass

* Keycard Blackwood on agreed Diamonds suit (last suit bid )

** Two Aces and King of Diamonds

Two Kings were with the opponents.

Tricks:    
1.      SJ    SA    S5    S2
2.      DA    D7    D2    D3
3.      D4    D8    DK    C4
4.      HA    H2    H7    H5
5.      H3    H4    HK    H6
6.      HQ    C2    S7    H9
7.      H8    C3    D5    HJ
8.      CA    C5    C8    C7
9.      C9    C6    CQ    CK
10.    SK    D9    S3    S4
11.    CJ    CT    D6    S8
12.    HT    S9    DJ    S6
13.    DQ   SQ    DT    ST

A small slam in Diamonds, but actually made 7 Diamond!

Bidding:

  W       N         E         S
pass    1S       pass    4C*    With opening points in North and 18 in South, a slam was on!
pass    5H**    pass    6C*
pass    6NT*** pass    7NT
pass    pass     pass

* Gerber (Slam bidding in NT asking for Aces and later for Kings)

** 1 Ace

*** 3 Kings

Hold all the Aces and all the Kings

Tricks:    
1.      C4    CT    CQ    CK
2.      SA    S3    S2    S4
3.      S7    S9    SK    S8
4.      SQ    SJ    ST    D3
5.      S6    C5    C3    D4
6.      S5    C8    H2    D6
7.      D5    D2    DQ    H5
8.      D7    C2    DA    D8
9.      DK    D9    H4    C6
10.    H6    H3    HJ    H9
11.    H8    HT    HK    HQ

Claim (in Show Menu) for the last two tricks, making 13 and the Grand slam!

Yes it is a small slam in 6NT.

Although 5 Diamonds by South could make, an optimal bid would be 3NT by South which should make 11 tricks. West should lead the K♣.

Try 1 Club, aiming to bid 2NT next showing 17/18 points.  North bids 1NT showing 6-9 points.  South bids 2NT - asking and North should bid 3NT (which makes).