Complex Multi-Conditional IF Function, return value - excel

Question

I need some help returning a desired figure with a complex formula. I've included a sample table with some dummy data, and have almost reached the solution which returns the correct true/false conditions but need some help printing the figure. My brain is a bit frazzled after working on this for a while...
PROBLEM:
I need to print the figure (6000/3000/0) based on not only calculation rule, but also return 0 if the calculated was already printed at the first instance.
RULES
Method Saving (Column E) is calculated using the methodology:
For each university with the same Product (col B), and same Agreement Year (col C), where Total (col D) returns: (6,000 if over 12,500 / 3,000 if under 12,500 / 0 if total = 0)
That is quite easy to achieve ^ -- however, the tricky part comes in when trying to only print the method saving figure once for each entry of the same university, same product and same agreement year.
Looking at the example table below, rows 2 & 3 both have the same university, product and agreement year. It's quite easy to produce a formula with multiple IF statements to print the calculation of either 6000/3000/0, however I only want to print the method saving figure once, at the first instance, following that the method saving figure should be 0.
Worth noting that in Row # 4, 6000 will be printed because even though University and Product are the same, the Agreement Year is different.
Row 1
University (col A)
Product (col B)
Agreement Year (col C)
Total (col D)
Method Saving (col E)
2
Manchester University
Photoshop
2022-2023
20,000
6,000
3
Manchester University
Photoshop
2022-2023
20,000
0
4
Manchester University
Photoshop
2021-2022
14,000
6,000
5
Manchester University
Photoshop
2021-2022
14,000
0
6
Oxford University
Illustrator
2022-2023
8,000
3,000
7
Cambridge University
Figma
2022-2023
0
0
8
Cambridge University
Linux
2022-2023
13,000
6,000
9
Bristol University
Linux
2022-2023
0
0
10
Coventry University
Lightroom
2021-2022
20,000
6,000
11
Coventry University
Lightroom
2022-2023
10,000
3,000
12
Coventry University
Lightroom
2022-2023
10,000
0
13
Coventry University
Photoshop
2022-2023
4,000
3,000
I have already worked on a potential solution, which may not be the most efficient, but for times sake it has gotten me the furthest. I've edited the cell references to match the dummy data table.
=IF(OR(AND(E1<>"",B2<>B1,C2<>C1),AND(E1<>"",D2=D1,C2<>C1)),
OR(AND(A2=A1,B2=B1,D2<12500,D2<>0),3000,
OR(AND(A2<>A1,B2<>B1,D2<12500,D2<>0),3000,
OR(AND(A2=A1,B2<>B1,D2<12500,D2<>0),3000,
OR(AND(A2<>A1,B2=B1,D2<12500,D2<>0),3000,
OR(AND(A2=A1,B2=B1,D2>12500,D2<>0),6000,
OR(AND(A2<>A1,B2<>B1,D2>12500,D2<>0),6000,
OR(AND(A2=A1,B2<>B1,D2>12500,D2<>0),6000,
OR(AND(A2<>A1,B2=B1,D2>12500,D2<>0),6000,
OR(D2=0,0,0))))))))),0)
The above formula when entered will correctly return TRUE or 0 based on the criteria above, so it has managed to figure out the logic behind it -- I'm just now having trouble at the very end to print the respective figure (6000/3000/ or importantly 0 if either Total is 0 or the figure has already been printed)
Let me know if you have any ideas / need me to clarify anything!
Thanks!

Answer 1

Try this in E2 and fill down:
=IF(COUNTIFS($A$2:A2,A2,$B$2:B2,B2,$C$2:C2,C2)=1,VLOOKUP(Sheet3!$D2,{0,0;1,3000;12500,6000},2),0)
I used a lookup table to determine what to return, and a COUNTIF to only return a non-zero if the entry is the first that matches those first three columns.