Multiple IF statements without adding them together - excel-formula

Question

I am trying to write a formula in Excel that is comprised of 6 separate formulas each with multiple criteria, I will try and explain what I am trying to do below.
If the value in B7 is 2 and the value in F7 is between 3 or 0 the value in G7 is assigned as A, if the value in B7 is 2 but the value in F7 is between 4 and 6, the value in G7 is assigned as B etc..
I have managed to get it working when the value in B7 is 1 but I cannot get it working for when the value is 1 or 2.
I have tried using the & between the two formula but all it does is add them together. I have tried using ELSEIF, IF(OR(AND as well as multiple other combinations, all to no avail. My formula for when the value in B7 is 1 is below.
=IF(AND(B7=1,F7<=1),"A",IF(AND(B7=1,F7>=2,F7<=4),"B","C"))
One example of what I have tried to get it working for 1 and 2
=IF(AND(B7=1,F7<=1),"A",IF(AND(B7=1,F7>=2,F7<=4),"B","C"))OR(IF(B7=2,F7<=3),"A",IF(AND(B7=2,F7>=4,F7<=6),"B","C"))
Thank you

Answer 1

This is a combined formula with 2 Approx. Lookup formulas for Table 1 and Table 2 as show in below picture
1] Approx. Lookup formula for Table 1 :
=LOOKUP(F7,{0,2,5},{"A","B","C"})
2] Approx. Lookup formula for Table 2 :
=LOOKUP(F7,{0,4,7},{"A","B","C"})
3] To choose Table 1 or Table 2 using CHOOSE function
=CHOOSE(B7,{0,2,5},{0,4,7})
So, the combined formulas become >>
=IFERROR(LOOKUP(F7,CHOOSE(B7,{0,2,5},{0,4,7}),{"A","B","C"}),"")
Finally add an error trap IFERROR function in return blank for B7 give number other than 1 or 2.