Which programming language to use ?

Hi guys I am about to start preparing for an upcoming examination which requires coding in java, python or c++
below screenshot contains the syllabus of the examimage
I know python and c++. I am used to python but some suggest not to use python in coding exams because of its slow speed.
In c++ I know how to write a basic program and don't know anything about STL library and how to use them. My exam is on 20 Jan 2021.
So please suggest which language should I used to write in my exam and to practise these topics.

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