\documentclass{beamer}
	\usetheme{TelecomNancy}

	\documentclass{beamer}

	\usetheme[
		toccolumns,
		tocnbsections=3,
		addsecspace,
		backgroundtitlepage=myBackgroud.png,
		logo=myLogo.png,
		firstcolor=color1,
		secondcolor=color2,
	]{TelecomNancy}

	\definecolor{color1}{RGB}{100, 100, 100}%
	\definecolor{color2}{RGB}{220, 0, 0}%

	\documentclass{TelecomNancy}

	\begin{document}

		\coursetitle{Title of course}
		\courselevel{Course level}
		\courseyear{Year}

		\nextExercise{}

			\nextQuestion{First question of the current exercise}
			\nextQuestion{Second question of the first exercise.}

			\nextInstructions{
				Some specific instructions for the next questions of the current exercise.
			}

			\nextQuestion{Last question of the first exercise.}

	\end{document}

	\documentclass[headheight=4.5cm,
				   margin=2cm,
				   titlewidth=0.6,
				   sansserif,
				   firstcolor=color1,
				   secondcolor=color2,
				   % logo=myLogo.png,
				   % footband=myFootBand.png
				  ]{TelecomNancy}

	\definecolor{color1}{RGB}{100, 100, 100}
	\definecolor{color2}{RGB}{220, 0, 0}

	\begin{document}

		\coursetitle{Title of course}
		\courselevel{Course level}
		\courseyear{Year}
			
		\globalinstructions[Optionnal title, ``Global Instructions'' by default]
		{
			The global instructions.
		}

		\nextExercise[This is the first exercise]{
			You can write here instructions of the first exercise... or nothing.
		}

			\nextQuestion{First question of the current exercise}
			\nextQuestion{Second question of the first exercise.}

			\nextInstructions{
				If you need to add some specific instruction for the next questions of the current exercise.
			}

			\nextQuestion{Last question of the first exercise.}

		\nextExercise{}

			\nextQuestion{First question of the current exercise}
			\nextQuestion{Second question of the second exercise.}
			\nextQuestion{Last question of the second exercise.}

	\end{document}