Primary School-level Q - "அகர வரிசை"
Please educate me with something basic; for the அகர வரிசை of the 18 மெய்யெழுத்துகள், I see textbooks & online resources teach the standard க், ங், ச், ஞ், etc. but also have the series on வல்லினம், மெல்லினம், இடையினம் (க, ச, ட, த, etc.) Example: https://discovertamil.com/resources/tamil-alphabet
The Question is, are primary school kids supposed to learn both these series? Can you tell me more about how these are approached (whether the logic is taught, how this becomes helpful in higher grades, etc.?).
Context: This is for a primary govt school exercise in interlingual learning in Karnataka. We have mostly Kannada & few Tamil students (& no native Tamil teacher yet), and we're able to very slowly go through the very helpful TN state syllabus textbooks.
நன்றி!