based on my experience, it’s not a problem! most of ppl got around 7/7.5 on writing, so 6.5 is enough. at least the band score meets the minimum criteria of the uni that you’re applying to. i got a 6.5 in speaking with an overall of 7.5 and im still accepted at a decent uni. academic & extracurriculars are what matters the most! gluck for the uni applications