Vice-Captain Nathan Sealy starred with the ball with 4-21 from nine overs to help the men in maroon restrict New Zealand to 131 all out in just 39.2 overs.
They then needed just 24.5 overs to reach 132-4 thanks to an unbeaten 58-run match-winning partnership between Joshua Dorne and wicket-keeper Jewel Andrew.
Dorne ended up 45* off 66 balls including three fours while Andrew finished 36* off just 24 balls, hitting one four and three sixes.
Jordan Johnson (14) and Steven Wedderburn (10) also chipped in for the Windies.
New Zealand Captain Oscar Jackson took 2-14 from three overs.
The West Indies will take on Nepal in their next warm-up match on Tuesday.
In the match played at the Diego Martin Sports Complex in Trinidad and Tobago, Zimbabwe Under-19s won the toss and elected to bat first.
This proved to be a good decision as they batted well to amass 256-4 off their 50 overs thanks to half-centuries from David Bennett who made 77 not out off 105 balls and Brian Bennett, who made 62 off 84 balls. Connor Mitchell provided the Zimbabweans with an important late innings push with 42 not out off 26 balls.
Johann Layne took 2-44 off seven overs for the West Indies.
A pair of stunning innings from Kevin Wickham and Teddy Bishop ensured the West Indies chased their target without much trouble.
Wickham scored a well-played 104 off 116 balls with 17 fours.
The 18-year-old Barbadian, who was originally one of the reserves for the squad, got his third score of 50 or more in four matches in the tournament after getting 56 against Sri Lanka and 61 against Papua New Guinea.
Bishop got the second hundred of the innings and third for the West Indies in the tournament with a brilliant 112 not out off 121 balls with 11 fours and one six.
Rivaldo Clarke got 28 not out and was at the crease with Bishop when the young Windies eventually got to 262-2 off 49.2 overs to seal the win.
Wickham, with 243 runs in four innings including one hundred and two fifties, was the West Indies leading runs scorer while pace bowler Shiva Sankar was the team’s leading wicket-taker with nine scalps in six matches.
West Indies Under-19s won the toss and bowled first. That proved to be a good decision as the Scottish batsmen were unable to withstand a quality bowling performance from the West Indians, eventually being bowled out for 95 in 35.1 overs.
Opening bowler Shiva Sankar, who was voted man of the match, led the bowling for the home side with 3-17 from his seven overs.
Spinners Onaje Amory and Anderson Mahase took 2-26 off 10 overs and 2-16 off 5.1 overs, respectively.
The West Indies had a relatively easy chase, losing just three wickets in their pursuit of 96 for victory.
Openers Shaqkere Parris (26) and Matthew Nandu (8) as well as wicket-keeper/batsman Rivaldo Clarke (13) were the batsmen out.
Teddy Bishop and Jordan Johnson finished not out on 23 and 14, respectively, to help the West Indies successfully chase their target in 19.4 overs.
West Indies Under-19s, Australia Under-19s, and Sri Lanka Under-19s now all have two points with the West Indies leading the group on net run rate.
Sri Lanka Under-19s and Australia Under-19s were locked in battle in the other Group D match on the day with the Aussies being bowled out for 175 and Sri Lanka on 44-3, from nine overs, in pursuit of their target.
UAE won the toss and elected to bat first, reaching 224-9 off their 50 overs thanks to half-centuries from Aayan Khan (93) and Shival Bawa (51).
Shiva Sankar led the way for the Windies bowlers with 3-31 off nine overs while Nathan Edward and Matthew Nandu took two wickets each.
Jash Giyanani and Dhruv Parashar then combined to take seven wickets between them to restrict the West Indians to a modest 142 all out in reply.
Nathan Edward (51), Kevin Wickham (22), and Isai Thorne (17) were the only batsmen to score double figures against Giyanani’s 3-21 off 10 overs and Parashar’s 4-30 off nine.
The West Indies will now play the loser of the Plate semi-final between Ireland and Zimbabwe in the 11th place playoff while UAE will play the winner in the ninth-place playoff.
The Plate tournament is contested between the eight teams that failed to advance to the Super League quarter-final stage of the competition and is an important phase of the competition for the development of the young cricketers.
The young Windies finished third in Group D behind Sri Lanka Under-19s and Australia Under-19s after only picking up one win in their three group games, a seven-wicket win over Scotland.
The other plate quarter-final matchups are UAE U-19s vs Uganda U-19s, Ireland U-19s vs Canada U-19s and Zimbabwe U-19s vs Scotland U-19s.
After the quarter-finals, semi-finals and finals are completed, the winner of the Plate tournament will be crowned overall ninth-place finishers at the ICC Men’s Under-19 Cricket World Cup.
The Super League quarter-finals will see England U-19s facing South Africa U-19s, an All-Asia affair with Afghanistan U-19s facing Sri Lanka U-19s, a rematch of the 2020 final with India U-19s facing defending champions Bangladesh U-19s before Australia U-19s do battle with Pakistan U-19s.
The champions will be crowned on February 5 at the final at the Sir Vivian Richards Stadium in Antigua and Barbuda.
Sri Lanka won the toss and chose to field first, and despite the continued absence of regular captain Ackeem Auguste, who made 57 in the first match against Australia U-19s, West Indies Under-19s got their highest total of the tournament with 250-9 off their 50 overs.
In the must-win encounter, Kevin Wickham, playing his first game of the World Cup, top-scored with 56.
He was well supported by Jordan Johnson, who got 47, as well as Rivaldo Clarke and Teddy Bishop, who got 45 each.
Sri Lankan captain Dunith Wellalage, who has so far taken two five-wicket hauls in the tournament, was again the pick of the Sri Lankan bowlers with 3-39 off his 10 overs.
Despite a valiant effort from the West Indies Under-19s bowlers, Sri Lanka were able to get to their target, finishing on 251-9 with 10 balls remaining.
Opener Sadisha Rajapaksa top-scored for the Sri Lankans with 76 and he got support from Anjala Bandara (40) and Shevon Daniel (34).
McKenny Clarke led the West Indies bowlers with 2-38 off his 9.2 overs while Isai Thorne took 2-41 off 10 overs.
Sri Lanka Under-19s and Australia Under-19s will now advance to the Super League stage as the top two finishers in Group D.
The tournament hasn’t ended for the West Indies Under-19s, however, as they will now compete in the plate quarterfinals.
Their innings got off to the worst possible start as opener Matthew Nandu was dismissed with the second ball of the innings by Tom Whitney to leave them 1-1.
The second wicket fell soon after as Whitney removed West Indies U-19s number three batsman Teddy Bishop for five, in the fifth over, to leave the score at 12-2.
Opener Shaqkere Parris became the third man to go in the very next over after being dismissed by William Salzmann for four to leave the young Windies 12-3.
Captain Ackeem Auguste (14) and Rivaldo Clarke (8) ensured that West Indies U19s lost no further wickets in the first 10 overs, carrying the score to 38-3.
Auguste and Clarke continued to look assured as they brought up 50 for the West Indies U19s after 13 overs.
After 20 overs, West Indies U-19s were 99-3 thanks to more quality batting from Auguste (46) and Clarke (37).
Auguste brought up two milestones with one shot in the 21st over, bringing up a classy 50 off 54 balls and the West Indies 100.
Australia U-19s got a much-needed breakthrough when Clarke went off the bowling of Nivethan Radhakrishnan for 37 to leave the score at 107-4 after 21.5 overs.
Giovonte Depeiza joined Auguste at the crease but didn’t last long, being dismissed by Australian captain Cooper Connolly for a duck to leave the young Windies 109-5 off 23 overs.
Connolly got his second wicket at the start of the 25th over, removing Auguste for a quality 56 to leave the score 112-6.
Radhakrishnan dismissed Anderson Mahase for six in the 28th over to take his second wicket and continue Australia’s stranglehold on the West Indies U19 batting line-up to leave them on 124-7.
After 30 overs, West Indies Under-19s were 131-7 with Johann Layne on 12 and McKenny Clarke on two.
Layne became Radhakrishnan’s third wicket in the 32nd over for 12 to leave the score at 131-8.
Connolly took his third wicket and Australia’s ninth when he removed Shiva Sankar for seven to leave West Indies U-19s 145-9.
Three McKenny Clarke sixes in the 38th over brought the score past 150.
After 40 overs, the West Indies U19s were 168-9 with McKenny Clarke on 29 and Onaje Amory on zero.
The innings was finally ended when McKenny Clarke was dismissed by Tom Whitney in the 41st over for 29.
Tom Whitney was the pick of the Australian bowlers with 3-20 off 8.1 overs and Nivethan Radhakrishnan supported him well with 3-48 off 10 overs.
