I am really confused about the categories which I need to apply.

I am currently working in a company nearly for one and half years hours permanent contract 7.50 an hour but, when I calculate my income it is not exceed the financial requirements. I do have a second job (7.50 and hour - 16 hours a week and I get paid 520 each month but, I only have 5 payslips from there.
On the other hand my wife is employed as well but she was on maternity and she has been paid 127 each week.
I am really confused about which category to apply and how to calculate my and my partner's income.
We have a joint account 12 months bank statements stamped by the bank
I got 12 months payslips from my first job and 5 payslips from second job
and my partner has got 12 months but last two months has not been paid because of maternity payment i only weeks
I would be very grateful for any answer. Thank you.