Hey Divya!
If you Google libgen, then you will get a bunch of sites from where you can get books online for free.
For Real Analysis:
For linear Algebra:
1. Linear algebra done right by Axler
2. The book by Friedberg and two others is also pretty good
3. Algebra by Artin is nice as well.
For Modern Algebra:
1. Abstract Algebra by Dummit and Foote
2. The book by Gallian can be used as well.
All the best!
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