Running KhiCAS in exam mode works only with OS 5.2. If you have OS 5.3, you must
first downgrade your OS version with backSpire
https://tiplanet.org/forum/viewtopic.php?f=43&t=25952

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! Beware !
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It is the user responsability to ensure that CAS is allowed during exam.

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Entering exam mode
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Open KhiCAS shell, either run khicas.tns or from khicaslua.tns type * enter.
Type the calculator key (between esc and tab) then the e^x key.
KhiCAS will check all files in the ndless directory and copy the required ressources
in the exam directory mode. This take some time, you can accelerate it by keeping
only one khicas.tns or luagiac.luax.tns and by deleting ressource files that do not
correspond to your OS. Once the copy is finished, the calculator reboots in exam mode.
If the calculator is off and does not reboot, press the Reset button.
Once reboot is finished, you will have to activate ndless, then you can run KhiCAS.
The whole process takes up to 2 minutes.
Note that the calculator reboots from time to time at the ndless activation step.
Don't panic, leave the calc reboot and activate ndless again.

If you need to reactivate exam mode: from KhiCAS shell, press the calculator key then e^x key
and confirm. KhiCAS will clear all files in the exam mode directory except the ressources
required to run KhiCAS. Then LEDs are set to off. You are left in restricted mode, no
save, no load. Leaving KhiCAS will reboot the calculator and restart the LEDs.

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Warning:
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If you run OFF then Esc-ON then Reinit exam mode, this will not keep the ressources
required to run KhiCAS. Educational institutions that forbid CAS in exam might ask
their students to reinitialize pure TI exam mode that way.

Institutions that do not want to allow KhiCAS in exam mode can ask students to
reset the calculator, then OFF esc-ON then restart exam mode.