Short answer: Agree on a return date, how the book will be handled and who pays if it is damaged. A short, clear understanding before you hand over the book prevents most problems.
Why sharing books works
Two students who need the same expensive book for different hours of the day can often manage with one copy. Sharing also helps when a book is needed only for a short stretch, such as a unit or a revision week.
It only works when both people respect the rules. A book that comes back late or damaged can cause more stress than the money it saved.
Agree before you hand it over
Say out loud what you expect. How many days can the book be kept? Is writing allowed? Can it be lent to a third person? Most disagreements come from rules that were assumed rather than stated.
Note the condition at the time of handover. A quick look through the pages together, or even a photo of the cover and spine, avoids arguments about what was already there.
Keep track of where the book is
Write your name inside the book and note who has it and until when. A phone reminder for the return date works better than relying on memory. If the book goes to another person, ask for it back first.
Protect it in transit. Carry the book in a bag, not loose in your hands, and avoid placing a bottle or tiffin in the same compartment.
When not to share
Avoid sharing a book you need every day, or a workbook you are writing in. Avoid lending to someone who has returned books late before. It is fine to say no politely.
If a friend is in the same situation, suggest alternatives such as a library copy or a used copy that they can buy for themselves. That keeps the friendship and your own study plan safe.
Quick checklist
Before you lend: write your name in the book, agree the return date, note the condition and say whether writing is allowed. Four small steps take two minutes and protect both of you.
When the book comes back, check it together. If something has changed, talk about it the same day while it is easy to sort out.
Plan for the end of the course
When the course or exam is over, decide what happens to the book. You can keep it, pass it to a junior, or sell it. If you decide to sell, check the edition and condition first and see how to price your used books.
If you do not have a classmate to share with, you can also look at second hand books for a lower-cost copy.
Finally, say thank you and return the favour. Sharing works over a whole course when both people feel it is fair, and a good sharing habit often continues into the next year with juniors.
Frequently asked questions
Is it okay to write in a shared book?
Only if both agree. Pencil notes that can be erased are safer than pen or highlighters.
What if the book is damaged while it is with a friend?
Decide beforehand how you will handle it. Many students agree to repair or replace the book, or to share the cost.
Should I lend a book that I still need?
Only if you can spare it for the agreed days. Lend books you are not using that week.