Can I prep for an exam using only ChatGPT Projects?

Yes if you upload the syllabus and set clear instructions, but citations back to the PDF are not the core product: you should cross-check claims by opening the file. For «only answer from my notes and tell me which page», NotebookLM is usually more direct.

Does NotebookLM replace a ChatGPT Project?

Not entirely. NotebookLM wins on cited synthesis and review of fixed sources. A Project wins when you also draft deliverables, run several threads or mix study with day-to-day work in the same container.

How many sources or files should I add?

Both work better with a tight scope per deliverable (one exam, one report). On NotebookLM, mixing topics in one notebook dilutes answers; on ChatGPT, irrelevant files clutter context. No fixed numbers: start small and add only what you query.

What about NotebookLM Audio Overview?

It helps you review in audio material already indexed in the notebook, after a briefing in Studio. It is not a substitute for taking notes in ChatGPT: different layers (passive review vs active drafting). See notebooklm-audio-overview.

Common pattern: NotebookLM for map and citations over the corpus; a ChatGPT Project to practice writing, simulate open questions or follow the course with instructions that do not change every week.

NotebookLM vs ChatGPT Projects for studying documents

A notebook with citations only from your sources vs a Project with files, instructions and chat threads. Which to use to review material, prep for an exam or keep ongoing work on track.

	NotebookLM	ChatGPT
Best for	Studying a closed pack of sources with mandatory citations	Long-running work with files + instructions + general chat
Source anchoring	Only what you upload to the notebook; citations to the passage	Project files + pasted context; no automatic PDF passage cites
Study outputs	Guides, FAQ, maps and Audio Overview in Studio	Free-form questions, tables, drafts and variants in the thread
Threads and continuity	One notebook per topic; chat revolves around those sources	Several chats inside the Project inherit instructions and files
Beyond uploaded material	Does not replace wide web search (use another tool)	Search, voice, images and general tasks per plan
Ecosystem	Google account; fits team Drive and Docs	OpenAI account; GPTs and the rest of chat outside the Project
Main risk	Mixing topics in one notebook and confusing citations	Assuming it «remembers» a file that is not in the Project

Verdict

Pick NotebookLM when the goal is to master a fixed set of material you already have (PDFs, Docs, videos, notes) and you need answers with passage-level citations, Studio briefings or audio review without blending in the open web. Pick ChatGPT Projects when studying is part of ongoing work: same tone and format instructions, several parallel threads, drafting deliverables, web search or general questions on top of project files. Common combo: corpus and cited map in NotebookLM; drafts, variants and weekly follow-up in a Project. First steps: notebooklm-primer-briefing and notebooklm-audio-overview for the notebook; chatgpt-projects-primer-flujo to set up the ChatGPT container.