Hey,

No, it is not mandatory to take a complete IRC test on TCS NQT. In case you've missed it, you will get a chance to give DRC which is Dry Run Check. These, IRC and DRC are to ensure that your system is compatible to give the actual assessment. In case any problem occurs you can opt for in centre or any other place to give your exam. In case you don't give either of the two, you won't face any problem.

I hope this helps,

All the best.