Theory:

     "This has got to stop immediately, Justice Mathematics said in a stern voice, rapping the hammer for silence in the court.
 
     He pushed back the horn-rimmed glasses up his nose and glared first at Mahesh and then at the crowd in the court. Everybody respected him, even Mahesh, so a pin-drop silence fell in the court instantly.
 
     "Let us proceed," Justice Mathematics said nodding his head.
 
     "Your witness, first," he gestured at the torn Ms. English.
 
     Mahesh chewed his nails nervously.
Explanation:
 
The entire story had happened in Mahesh's dream, in a court where Mathematics was the Justice.  Justice Mathematics was a very strict person who ordered to stop talking immediately. He spoke in a strict way that nobody can argue against, and he had hit the hammer hard, requesting the court to be silent.
 
The Justice pushed back the horn-rimmed glasses up his nose and looked at Mahesh angrily. He then looked at the crowd in the same way. Everyone in the court obeyed his order with great respect, including Mahesh. There was an immediate pin-drop silence everywhere in the court after the Justice's command.
 
He then called upon Ms. English as a first witness. Ms. English looked torn. Mahesh, who was observing things that goes around him in the court, was worried. He started to chew his nails out of fear that something bad might happen.
 
Meaning of difficult words:
 
S.No
Words
Meaning
1.
Stern
Being strict or severe
2.
Rapping
Hitting very hardly
3.
Horn-rimmed glasses
Refers to glasses made of tortoise shell or thick plastic
4.
Glare
To look at something very angrily
5.
Command
An order
6.
Instantly
Immediately
7.
Rigorous
Being strict
8.
Nod
To move your head up and down in a way to say 'yes'
9.
To proceed
To continue or go on
10.
Gesture Refers to a movement with a hand or head in order to show or tell something
Reference:
State Council of Educational Research and Training (2019). Term-3 English Standard-6. BROUGHT TO BOOK: Madhumita Gupta (pp. 109-112). Published by the Tamil Nadu Textbook and Educational Services Corporation.