How should i make an essay structure in the exam?

Hi, Generally, an essay structure contents 5 paragraphs like introduction, supporting idea 1, supporting idea 2, supporting idea 3 and conclusion. Tomorrow, im going to write an exam about english proficiency at University because im esl student. I will have 30 minutes to write an essay, the question is. Should i make the essay structure with 5 paragraphs? or is anyway to modified this format just for tomorrow test? the university suggest me to write a strong thesis statement and conclusion,however, it does not advice me about essay structure. the fact i don't write a 5 paragraph essay will make me fail? what is your advice to me? thank you guys