Unfortunately don’t have the 4gb of this chromebook so can’t compare . I would say if you enjoy multitasking like few taps and couple other apps open then yes 6gb model will def make the difference
If you can find it on sale for around 200$ should be a good buy . I wouldn’t spend more then that on it . At retail price of 300$ u can buy few different options especially during Black Friday
Yes it’s good for school keep in mind this is big screen and a bit heavy if u plan to taking it to college . When it comes to Microsoft office it’s only available on browser . There is no app