Hi Satish sounds like quite a journey and you would have seen a lot of changes in that time.
The IBM training are is a good place to start.
Search - IBM Training - Global
The training site also covers the certification pathways. For Maximo you can choose self paced or instructor led.
Maximo Application Suite - IBM Training
hope tat points you in the right direction
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Michael Kasteel
Director
ISW
0402830412
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