From GATE 2021, You are allowed to opt for two papers with some conditions for Paper II.
The Application FEE for GATE 2023 depends on the Regular Period and Extended Period.
For Regular Period (Per paper):
For Female Candidates: ₹850 only, For SC/ST/PwD Candidates: ₹850 only, For All other Candidates: ₹1700 only
For Extended Period (Per Paper):
For Female Candidates: ₹1350 only, For SC/ST/PwD Candidates: ₹1350 only, For All other Candidates: ₹2200 only