Hi 

For group 4 exam as per the eligibility for the respective exams you should have it's elgibilitiy.(  10th base elgibilitiy and 12th base elgibilitiy )

And you must be atleast 18years old for the examination .

If yo want to write group 4 right now , you should check as per your elgibilitiy .you can give your examination for 10base level exams only )

Thanks