Getting a band score of 7 depends on what you are applying for. Now they have introduced a system called Skill Select through which you apply for a specific visa category based on your points. But anyone should have at least 6 in each component to access that system. If you get 7 in each band, you get 10 points for that. If you are in between 25-32 of age, you get 30 points, If you have a degree or masters with a valid skills assessment, you will get a maximum of 15 etc..