1. As per the Society Model Bye Law No 22 to 24, a member has the right to inspect free of cost books, registers, documents etc. as provided in Section 32 (1) of the Act and get copies of the documents as provided under Section 32 (2) of the Act, on payment of the fees prescribed under the bye-law No. 172. This suggests that you should be able to access documents from before you became a member.
2. If your society has not been sharing documents for the last 3 months, you could consider taking legal action. If documents are not made available to a member, the committee could be made to pay a fine. You may also file an appeal before the registrar of society or send a legal notice to the society.
3. Regarding access to documents for different wings in your society, I couldn’t find specific information. However, if your society’s registration is common for both wings, it would seem logical that you should have access to documents for both wings.
I hope this answer helpsy you!