Online exam form related quary

No. you don’t need to resend the printout.

I think, the NOT RECEIVED MESSAGE may be due to non-updation of Speed post tracking status by the postal dept.

Besides, If your printout doesn’t reach the institute before the exam, Exam dept. will send you a letter to confirm, before the announcement of exam results, the particulars provided in the online form (like your signature, regn no.  etc.) , which should be attested by your principal / any member of ICAI.  If you fail to comply with that letter, they may withheld your results. So please make an early response to any communication from ICAI reg the matter. If such a letter is not received before the exam you can take that you printout has been delivered in time.

So don’t worry.