The Annual Plan requires renewal every year, while the Lifetime Plan is a one-time payment for permanent membership.

Free cancellations within the first 30 days offer a full refund. After 30 days, you can cancel anytime within a year and receive 50% of your payment back.
For more details check - Refund Policy

Yes. Annual members can upgrade to Lifetime Membership at any time by paying the difference. 

You can upgrade your membership here.

Yes, you can get a referral discount if you were referred by an existing member.

Or else, you can choose to pay a higher membership fee to get an equal amount of credits, which would effectively make your membership cost-free. Credits can be used for your investment.

‍Lifetime Plan Members: Pay INR 5000 more to receive 10,000 Credits.
‍Annual Plan Members: Pay INR 3000 more to receive 5,000 Credits.

You can get credits & more details here.