Hi Pravin
I personally haven't taken SAPTEC or SAP01. Not sure if you have to do them or if they are desired. It might be worth contacting SAP Education in your country to discuss.
However, if your employer supports you cross-skilling, a SAP Learning Hub subscription would get you all the course content and Learning Rooms access for the price of one course. You could then study as part of work or out of hours. You can then access SAPTEC, SAP01 and the ADM* course guides as well as other content to assist you. It's an annual subscription but may be a good investment in your situation.
It sounds like your system is a complete mess and your management's cost cutting by not having skilled administrators is showing you have a great opportunity to improve your system's security and learn a new skill
If everything has been built in Production, then you can download the roles form Prod and upload to Dev (assuming SU24 data matches - good chance that it's never been properly used). All of this is covered in ADM940.
Good luck.
Regards
Colleen
