a. What is the goal of human life?

Aim of Human life is known as Purushartha (endeavours), “goals of human existence” or “the soul’s purpose.” The Hindu Human Pursuit is a progression through the four endeavors – Dhama, Kama, Artha, and Moksha.
Dharma is the right way of living, being conscious in your actions, words and thoughts and living a life that is lawful and harmonious.
Kama is desire. We cannot live without a desire or a goal in life. Desire should follow Dharma.
Artha is money. Money is an important goal in human life and should be earned according to Dharma and is best when utilized towards Moksha.
The ultimate goal for a human life is to attain Moksha, which means liberation from the cycle of birth and death.

Other reading material:

Relevant videos: Swami Nikhil Anand Hinduism Q & A: What is the aim of life?, 

Contribution: Geetha Ravula