Hello,
1) To view already filed Forms on MCA you have to Login to MCA website and after Logging in, you have to click on MCA Services Tab ------> View Public Documents -----> Enter Details of Company of whose docs. you want to search ----> Pay 100 Rs. Fees to MCA and all the documents filed with MCA will be available for downloading for a period of 3 hours from payment time.
2) Regarding which form do u want to know???
3) As per my knowledge, ADT-1 is compulsory for all companies who have appointed statutory auditors i.e those companies who are required to get their accounts audited by a Chartered Accountant as per Income Tax Act.
Regarding MGT-9, it is not an E-form that you need to file with ROC but its just an extract of Annual Return i.e. MGT-7 which as per section 92(3) of CA, 2013 is required to be a part of Board's Report.
Thanks & Regards,
CS Shubham Agrawal