Change of Circumstance / error on application

I applied for student finance incorrectly last year, I'm a second year undergraduate, and have only just realised. I am 30 years old and live with my Mum and brother, I put down my brother's earnings as household income even though he does not support me in any way, neither does my mum, and I pay rent. I didn't realise I should be counted as an independent assessment.
I only work part-time as I don't have time to do anything else with my course. Meaning I have not received as much as I could have done, and m struggling financially.

Is there a way I can change my application for this year to reflect my actual income, which is significantly less, and possibly be able to get more maintenance loan in my next payment? or even an additional payment?

I've found a change of circumstance forms for part-time students but not full-time student.

B