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This seems to be just a replace issue easily handled by sed without the need for the power of awk.

The $ is the only character that needs to be quoted to prevent the system thinking a variable is...

I think your input should be:fruits,apple,20,fruits,mango,20,veg,carrot,12,veg,raddish,30
fruits,pinapple,10,fruits,orange,5,fruits,apple,20,Grains,wheat,100

---------- Post updated at 08:37 AM...

In any version of ksh newer than November 16, 1988, you can also use:
for ((i=2; i<=6; i++))
do <statements>
done
Although not available in the original 1993 version of ksh, the:
for ctcol in...

From what I know, range expansion {2..6} is a part of modern bash shell's parameter expansion feature and not a feature of ksh.

An alternative that will work for sure (even in old bourne shells):...

with open("a.txt") as f:
for line in f:
line=line.replace("\n","")
words=line.split(",")
words=[words[0]]+words[len(words)-2:]+words[1:len(words)-2]
print(",".join(words))

Another approach:
awk -F, '{$1=$1 FS $(NF-1) FS $NF}NF=NF-2' OFS=, file

$ sed "s/\([^,]*\)\(.*\)\(,[^,]*,.*\)$/\1\3\2/" file
a1,b1,b2,abc,jsd,fhf,fkk
a2,b3,c4,acb,dfg,ghj
a3,d4,d5,djf,wdjg,fkg,dff,ggk

awk -F, '{A=$1","$(NF-1)","$NF;sub($(NF-1)","$NF,"");$1=A}1' OFS="," file

$ awk -F"," '{i=$(NF-1);j=$NF;for(k=NF;k>=4;k--){$k=$(k-2);};$2=i;$3=j} {print $0}' aak
a1 b1 b2 abc jsd fhf fkk
a2 b3 c4 acb dfg ghj
a3 d4 d5 djf wdjg fkg dff ggk

Here is an awk approach:
awk '
{
for ( i = 1; i <= NF; i++ )
{
if ( $i == "LLL" && $( i + 1 ) == "SSS" )
...

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