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Like this (any awk):

$ tac file | awk '
    BEGIN{FS=OFS=","}
    NR==1{split($0, a, FS);next}
    NR==2{for (i=1; i<=NF; i++)
        if ($i == 1) $i=a[++c]}
   1 # aka print
' 

Replace tac file by tail -r file on *BSD

Output

0,0,65,70,0,0,75,80,0,85,0,85,0,90

Like this (any awk):

$ tac file | awk '
    BEGIN{FS=OFS=","}
    NR==1{split($0, a, FS);next}
    NR==2{for (i=1; i<=NF; i++)
        if ($i == 1) $i=a[++c]}
    1 # aka print
' 

Replace tac file by tail -r file on *BSD

Output

0,0,65,70,0,0,75,80,0,85,0,85,0,90

Like this:

$ tac file | awk '
    BEGIN{FS=OFS=","}
    NR==1{split($0, a, ",");next}
    NR==2{for (i=1; i<=NF; i++)
        if ($i == 1) $i=a[++c]}
   1 # aka print
' 

Output

0,0,65,70,0,0,75,80,0,85,0,85,0,90

Like this (any awk):

$ tac file | awk '
    BEGIN{FS=OFS=","}
    NR==1{split($0, a, FS);next}
    NR==2{for (i=1; i<=NF; i++)
        if ($i == 1) $i=a[++c]}
   1 # aka print
' 

Replace tac file by tail -r file on *BSD

Output

0,0,65,70,0,0,75,80,0,85,0,85,0,90

Like this:

$ tac file | awk '
    BEGIN{FS=OFS=","}
    NR==1{split($0, a, ",");next}
    NR==2{for (i=1; i<=NF; i++)
        if ($i == 1) $i=a[++c]}1
' 

Output

0,0,65,70,0,0,75,80,0,85,0,85,0,90

Like this:

$ tac file | awk '
    BEGIN{FS=OFS=","}
    NR==1{split($0, a, ",");next}
    NR==2{for (i=1; i<=NF; i++)
        if ($i == 1) $i=a[++c]}
   1 # aka print
' 

Output

0,0,65,70,0,0,75,80,0,85,0,85,0,90