M.Sc

You should prepare for CSIR NET (now known as NTA Joint CSIR-UGC NET)
UGC NET has no chemical sciences paper
CSIR NET has a Chemical sciences paper
As an M.Sc. Chemistry candidate for NET, you should choose Chemical sciences paper.

No, but you should have studied 2 math papers in your BSc to fulfill the eligibility.

Some institutes uploaded PDFs of the syllabus of M.Sc. Chemistry on the official website.
For example IITM, NITT, Pondicherry University, etc.

Sardar Patel University Gujarat is better as per reviews and rank.

1. Get strong with your basics.
2. Practice previous year's question papers.
3. Catch the topics that you may have skipped in your B.Sc.

For M.Sc. Chemistry admission in Loyola College, you should have passed your all graduation degree papers with a minimum score of 55-60% in aggregate. Apply online when admission is open (probably after April) on the official website and follow the guidelines mentioned on the website.

Yes,
You can apply for M.Sc. Chemistry.

Delhi University is the best university for M.Sc. And JNU is also good for M.Sc.

B.Sc. Chemistry takes 3 years,
M.Sc. Chemistry takes another 2 years,
Ph.D. Chemistry takes 3 to 5 years depending upon your research output and willingness. The general eligibility for B.Sc. Chemistry admission is passed in all subjects of 12th grade with Science subjects like PCM. Score as much as possible to get admission easily.