mixture of paye+ self employment (spouse visa)

[uziquestion]

I am in UK on spouse visa. I have a question for extension.

IN THE FIRST YEAR, my husband worked for two companies on paye (3200+8900=gross 12100) and worked on self employment (net 5550) too.

IN THE SECOND YEAR, he worked only on self employment (net 15600).
IN THE SECOND YEAR, I started working on paye (hourly rate) 7 months ago. My last 6 months' gross income is 4110.

Can I extend my spouce visa on this income ? Yes/no
Which category we should use ? Cat A or Cat B ?
How should we calculate the income ?
What documents does my husband need to submit ? (Only sa302 or payslips of my husband of first year too?)

I hope you will guide me, thanks a lot