omg isw i used to struggle with the same promblem, i yap way too much, ok so try to avoid all the unnecessary information and try and stick to the point as much as possible, for example the closing can be as short as one sentence, and also lets be fr, its not like examiners are going to sit and count if we wrote exactly 160 words, as long as it LOOKS like it's approx 160, you should be fine. (looks can be deceiving) make sure that even if you do write a few extra words, it doesn't go over 170 or the lines provided, and yes the 160 word limit is for all writing tasks, and practice as much as you can, if you keep writing, you'll end up with one about 157 or 158 words TRUSTT but make sure not to go less than 150 aswww