Degree classification with placement yr

Hi there,

Thank you for taking the time to read my questions. Apologies, its very very long.

My degree classification is: 360 points

1st yr- qualifying year. 15 credits x 8 modules

2nd yr- 15% . 15 credits x 8 modules

3rd yr ( placement ) - 10%
Placement contains different assessments, the largest mark goes towards a written piece/ presentations.

Final yr- 75%. 15 credits x 8 modules

1st yr I got a third class/ pass. 47% overall. 56 /120 credits.
In 2nd year now. Waiting on results. Still got second half of year to fix my grades. I need to achieve a 2:1 this yr. Its not looking so great at the moment not going to lie.

I REALLY WANT A FIRST FOR MY DEGREE.😭

Would anybody be able to work out;
A) if i got a 2:1 for this year if i would be able to get a first overall considering i get a 2:1 in placement and final year for a first overall.

B) if i got 2:2 this year, 2:1 for placement and final year for a first overall.

c) if covid restrictions happen again then i cant do placement. My degree classification would be 25%: 75% 2nd and final yr. If i got a 2:2 this year would i be able to get a first ? Alternatively if i got a 2:1 this year would i still be able to get a first ?

Also i don't understand the weighting e.g
56 grade for yr/120 credits x 15 % = 7

What on earth does the 7 stand for in terms of the final grade? A first is 70% above.

Does the 7 mean i have 63% more to achieve for a first overall or does this mean something else?

Regards.
Much appreciation for your time. Any help is useful.