As per the book Immortal talks, every soul has a level like T12 or T13; T14 being the highest. How do we know which level soul are we?
You can chose for this one to be your last birth. For that, you need to meditate. Once your Kundalini (Also known as Parashakti or the divine coiled energy) starts rising and all of your seven Chakras open, you will achieve enlightenment. Then, it will be the end of desires and thus end of re-birth.
He who knows the Supreme Brahman verily becomes Brahman. (Mundaka Upanishad 3.2.9) Brahman is not grasped by the eye, nor by speech, nor by the other senses, nor by penance or good works. A man becomes pure through serenity of intellect; thereupon, in meditation, he beholds Him who is without parts. (Mundaka Upanishad 3.1.8)
Till the time you have slightest of desire/attachment to this world, you will keep taking birth endlessly. To know, which is your last birth or what is your consciousness level, you need to introspect whether "Moksha" (liberation) is your ultimate goal of this life or not.
Though grouped among the minor Upanishads, the Yoga-Kundalini Upanishad is a very important work on Kundalini Yoga. It begins with an analysis of the nature of Chitta. It maintains that Samskaras and Vasanas on the one hand, and Prana, on the other, constitute the causes for the existence of Chitta. If Vasanas are controlled, Prana is automatically controlled. If Prana is controlled, the Vasanas are automatically controlled.
Thus, till the time you have desire, you will have re-birth.
The answer lies within you and only you are to chose. Stay firm once you do make a choice.
I am the Great Vak, Para-Shakti of the Universe. (Rig Veda.X.125.6-8)