Rajnath also appealed to the students to call off their protest.
Earlier, the Supreme Court had decided to hear on March 12 a plea seeking an investigation into the alleged Staff Selection Commission (SSC) exam paper leak.
Since February 27, students have taken to the streets of Delhi against what they term as "mass cheating".
Earlier on February 28, a group of students led by Bharatiya Janata Party (BJP) MP Manoj Tiwari also joined the protest.
On February 24, the SSC had released a notice, saying that the exam held on February 21 was delayed due to 'technical reasons' and would be re-conducted on March 9, 2018.