Most of the available cognitive assessment tools are for abnormal people.
I am trying to grade the cognition in normal people.
I am interested in doing research on effect of yoga on cognitive abilities in normal population.
You could use neuropsychological tests, as presumably you are anticipating improved neurocognitive performance. Though a risk may be a ceiling effect, if your participants score too highly. Your choice of tests would be dependent on what effects you expect from yoga, although in general working memory could be a good choice as it is sensitive to changes induced by the environment, stress etc.. Particularly working memory span tasks, as these are generally designed for use with normal populations and so you are unlikely to encounter ceiling effects.
It depends on the outcome(s) you are hypothesizing. There are all sorts of batteries you could use that are designed for typically developing adults, e.g., Wechsler IQ tests, Kaufman assessment batteries, etc. for overall cognitive ability. But maybe you're wondering about potential changes in attention or memory, or nonverbal reasoning, in which case you would look at other measures that focus specifically on these abilities. (There are no risks of ceiling effects unless you are somehow anticipating that your sample is either atypically gifted or that yoga will have a very large effect, as these tools are normed on reasonably large, representative samples.)
To further Graham's answer, you should decide whether you are looking to assess sensorimotor performance (e.g. improved reaction time) or improved executive function performance (i.e. working memory, response inhibition, task switching). There are a number of tests that have examined different indices of executive control within a non-clinical population such as the Stroop task, Eriksen Flanker task or a stop-signal task.
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