Index's row value cannot be "N/A". Check syntaxes.
=if(logical_test,true,false)
=index(array,row_num,[column_num])
=offset(reference,rows,cols,[height],[width])
=match(lookup_value,lookup_array,[match_type])
Try to write Your formulas step by step ...
=if(AND(I14=2,I15<8,I15>=0),true,false) ... and next You'll write one step of true or false
=if(AND(I14=2,I15<8,I15>=0),index(array,row_num,[column_num]),false)
... and so on. I hope that You get an idea. Okay?