first of all we want to be sure that you have read our guide for employees. On that page we explain that joining an a-kasse ONLY makes sense if your right to reside in Denmark extends beyond your job contract. We assume this in the following, also according to your previous question asked Feb 8, 2017.
So when you can (and also will) reside in Denmark also after your current job contract ends, it will be relevant to find out if you can get Unemployment benefits.
As you know there are some requirements. One of them is that you must have been member with an A-kasse for at least 1 year before applying for unemployment benefits. You tell you have been member since februar 2016, so there should be no problem.
The next requirement is the so called income-requirement ("Indkomstkravet"). And what is counted in the DKK 223,428?
Here in Denmark, all income you receive as a employee is subject to a tax called labor market contribution ("in danish: arbejdsmarkedsbidrag"). All income where you can see on the paycheck that there is deducted "arbejdsmarkedsbidrag", will be counted in the DKK 223,428. This include student work and off course your income from your current contract. But it does NOT include SU.
Another thing you must bear in mind is that there is a maximum for how much there can be counted for one month in the calculation of the DKK 223,428. This is DKK 18,619 per month for full-time insured. So even if you get good paid now, you must remember that you can only count DKK 18,619 per month. This also means that all people regardless of income have to work for at least 12 months for being eligible for Unemployment benefits. 12x18,619=223.428.
You dont need to make the calculation your self. When/if you apply for benefits the A-kasse can see all your information about income and they will make the calculation. Only if you have had foreign income or have income from self-employment, documentation is required.
I am not sure I fully understand what you mean by the third part of the question....but if it is not answered above or if you have comments, please contact us again.