Hello Mohita ,

At the moment it looks like both the entrance will be conducted on the same date I.e 29th April , 2018 again . If that happens it will be difficult to appear for both the exams. You can do only  one thing. Try to consider which exam will be suitable for your exam readiness and where you want to study for coming career option. If you feel that you are confident enough to score a good enough rank, NATA may be a smarter option. But if you are unsure about NATA, you have the option of UPSEE.

Best of luck !!!