Say it however it arrives
Work the thought out loud in Hinglish, then choose English as the written output and let the line land in English.
For students
You work out the idea in the language you think in and then have to write it down in the one that gets marked. That translation is where the evening goes.

Why it fits
Everything below is shipped today. Nothing on this page is a roadmap.
Work the thought out loud in Hinglish, then choose English as the written output and let the line land in English.
Dictation on Android has no monthly limit on any plan, and the free plan includes three hours a month on a laptop.
Dictate the point while it is still fresh, in a scratchpad you can come back to, rather than a photo of a whiteboard you never open.
The terms, the names and the abbreviations your subject uses. Add them once and stop correcting them.
Say the honest version, then ask for it more formal. Starting is the hard part and speaking starts faster than a blank page.
Privacy Mode discards the audio and the transcript immediately, and it is on the free plan.
The point of it
Not a trial with a clock on it. The free plan does not expire, and on Android there is no monthly ceiling at all.
Why Roman HinglishNot on a test sentence. Open the thing you were about to type and say it instead.