The passing score for IELTS in CRNBC is you should have a minimum overall test score of 6.5, minimum speaking test score of 7 and no score can be lower than 6. I believe your IELTS result should be no more than 1 year at the time of submission to CRNBC.
With regards to your question about SEC, I'm not the right person to review your transcripts and education since I'm not a CRNBC assessor. They have their standards and criteria in which I do not know. Each application is handled individually. There's no way to know whether you require SEC or not unless you submit all pertinent documents for review and yes, you need to spend money for that and do the leg work.
For more info, visit www.crnbc.ca
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