Sorry this is a very late reply! I took (and passed) the September sitting of SRM. I used TIA as my main source of studying and I thought it was very good. As I'm sure you've heard the computational questions aren't very difficult, but where they try to get you is on the "nitty gritty" qualitative questions. Most of these "nitty gritty" type questions had to do with trees, PCA, clustering, and GLM as a whole. I think TIA did quite a good job of preparing a lot of practice questions and sample exam questions that really made you think which was representative of the real exam. In saying that, I also used the ISLR as it's free and I thought this was an excellent secondary resource as well.
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