Theory:

     During my third year or fourth year of engineering, suddenly I had this desire to play cricket, first play for Tamil Nadu, then play cricket for India. Again, it was in my subconscious mind that I wanted to play for India.
Explanation:
 
He is telling about his life, that when he was studying third year or fourth year of engineering, he all of a sudden had a wish to play cricket. First, he wants to play for Tamil Nadu and later for India, but deep within his thought, he wanted to play for India.
 
Meanings of difficult words:
  
Numbers
Word
Meanings
1.
Suddenly Instantly.
2.
Subconscious Latent.
Reference:
State Council of Educational Research and Training (2018). Term-1 English Standard-9. Goal Setting - Kris Srikkanth (pp. 127-130). Published by the Tamil Nadu Textbook and Educational Services Corporation.