Chemistry Spl

Organic Chemistry is one of the best subjects.
To study it well, the most important thing is to have General Organic Chemistry on your tips. Start solving questions of GOC.
After that head to the new concepts which are the different reactions.
If you have done GOC well, you'll be able to write the mechanism of any reaction yourself to decide the product.
Now, again solve the questions on that particular topic.
I would suggest OP Tondon which is the best book for Organic Chemistry having questions on every topic.

IITs, IISc and NITs are the top most reputed institutes in India.
If you want to pursue PhD in chemistry then you have a great opportunity to get admission in that colleges which is IIT JAM Exam.
It is an entrance exam for M.Sc. which is conducted by IITs and IISc. By qualifying JAM exam you can get admission in IITs for M.Sc. (2 years), Joint M.Sc.-PhD, M.Sc.-PhD Dual Degree, M.Sc.-M.Tech., M.Sc.-M.S. (Research)/PhD Dual Degree and other Post-Bachelor Degree Programs.

Please refer to the link provided below for details regarding courses offered in Alagappa University. You can download their brochure which contains important information regarding courses conducted in Alagappa University.
https://www.shiksha.com/university/alagappa-university-karaikudi-23417

There are many career opportunities after M.Sc in botany. Candidate after completing his/her Masters can look forward to working with some industry giants or being a part of good research teams.

No, you don't need a gap certificate. In the application form, there is a column asking about the reason for the gap. You can write 'preparing for the entrance exam'.

Although, you won't get automatic updates via shiksha.com related to your M.Sc. entrance exam, you can ask questions and procure information online.