Organise (rather than a plan) a daily routine.

Fit homework into that routine.

A routine will allow you to carry out your daily activities as usual, but will prompt you to instinctively begin doing your homework as second nature. So really what you have to do is (from the beginning of school) decide on an order of daily events from the time you arrive home, to the time you go to bed. Doing this every day will ensure that you routinely carry out your homework.

To make sure you don’t try to over-plan things, you need to realise that what you do cannot be completely perfect, and don’t be too self critical, because you’ll keep revising versions of what you’ve already done until you run out of time to finish it. Sometimes meeting deadlines is much more important than achieving perfection.

Hope this helps.