Well aisha sis...so far as solving rd..book it depends on u whether u need or not...bt if u know all the solutions of rs...n ur concept is clear in all type of question....n if u have lots of time then u can go through rd...to check ur level...n if u don't have tym...then minutely...solve rs....it will be helpful...hope it will be helpful....

**Sources of Questions in Board Exams**

In addition to NCERT textbooks, questions in board exams can also come from other sources such as reference books and guides. Two popular reference books are RD Sharma and RS Aggarwal.

**RD Sharma**

- RD Sharma is a renowned mathematics textbook author who has published several books on mathematics.
- He has written textbooks for classes 6 to 12 and has also authored books on competitive exams like JEE and Olympiads.
- Questions from RD Sharma can be conceptual and application-based, giving students a deeper understanding of the subject.
- The book is widely used by students to prepare for board exams as well as competitive exams.

**RS Aggarwal**

- RS Aggarwal is another popular author who has written several books on mathematics, reasoning, and quantitative aptitude.
- His mathematics textbooks cover classes 6 to 10 and are known for their clear and concise explanations.
- Questions from RS Aggarwal can be straightforward and formula-based, helping students to build strong fundamentals in the subject.
- The book is also used by students to prepare for competitive exams like CAT, IBPS, and SSC.

**Conclusion**

While NCERT textbooks are the primary source of questions in board exams, it is important for students to also refer to other reference books like RD Sharma and RS Aggarwal to gain a deeper understanding of the subject. These books can provide additional practice and help students to build a strong foundation in mathematics.