Plat 1 definitely possibe, Plat 2 above very very very difficult. ping matters so much when you matched up against good player.. I'm from south east asia, so I have same issue as you, I usually bounce between plat 1 - gold 3, eventually ended up in plat 1 by end of season, so yeah possible. Although, I'm playing ranger, it's the most friendly class for high ping player imo. I understand the diffculty of playing melee class like warrior, it's hard to land the chain cc.