This section has Problem Sessions on nondegenerate as well as degenerate perturbation theory
This resources in this section of repository go beyond the standard text book problems for training and assessment. Many of these consist of challenge problems of higher order in difficulty.
Here is the link to video lectures of T. Padmanabhan of a course on General Relativity and Cosmology given by Prof.T.Padmanabhan (IUCAA, Pune) at IISER, Pune during Jan-April 2009. If you use them or if you have comments, it would be appreciated if you send a mail to paddy@iucaa.ernet.in.
https://www.youtube.com/results?search_query=padmanabhan+general+relativity+
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