Hi.. The best institute for learning French is Alliance française They've A1 A2 B1 B2 C1 classe.. depending on where you live, theyre in every big cities.. just type "Alliance française in india" you'll get everything.
Just like IELTS/TOEFL for English language, French have Delf/Dalf exam which are valid for life..
Delf(diplôme d'études en langue française) Is from A1 A2 B1 B2
Dalf C1 C2 Is for advanced level..
For further information... Go to their website..