Linking the need for a new educational institution to the 200th anniversary of Peter the Great's birth in the same year, the school was named Tallinna Peetri Reaalkool (German: Petri-Realschule zu Reval), which was supported by the city government and guilds with 1,700 silver rubles.

[3] Initially, the teaching was in German and took place in a three-story stone house located against the city wall with the address Lai 49, but already in 1883 it was moved to a newly completed school building on Estonia puiestee.

Germany continued its offensive on the Eastern Front, and in the fall of 1917 the islands of Western Estonia fell under German occupation.

The shortage of men and low combat morale forced the military leadership to take decisive steps to amend the front-line units, especially the crews of armored trains.

Among the organizers was Anton Õunapuu, the gymnastics teacher of Tallinn Secondary School of Science, who became the head of the machine gun commando, and Otto Tief.

[3] The first student soldier of Tallinn Secondary School of Science, who died in the War of Independence on December 8, 1918 was Harald Triigel.

Thirteen days later, on December 21, 1918, the next student of Tallinn Secondary School of Science fell - Gunnar Dobka.

Eugen Seeberg, the third student soldier of Tallinn Secondary School of Science in the ranks of Kalevlaste Malev defending Mõniste manor.

[3] According to Märt Karmo, 84 students of Tallinn Secondary School of Science participated in the War of Independence (not all of them were at the front, however).

The sculptor was Ferdi Sannamees and the architect was Anton Soans, an alumnus of Tallinn Secondary School of Science.

In addition to the monument, there is a marble plaque made for the four students and Õunapuu who died in the War of Independence, which is located on the wall of Tallinn Secondary School of Science hall, which was opened on February 24, 1923.

Because of that, in the fall of 1939, Paul Ederberg, nicknamed Pudi, a mathematics, physics and cosmography teacher who started working at Tallinn Secondary School of Science in 1919, also left.

Only recently, on January 25, 1940, had principal Karl Koljo encouraged class teachers to relentlessly defend and teach students the noble idea of Estonia retaining its independence.

Pertels' main mark in the history of Tallinn Secondary School of Science is considered to be the final bell tradition that was made during her tenure.

[7] On June 10, 1881, the Tallinn city government made a decision to build a new school house for Tallinna Peetri Reaalkool.

The location that was chosen was a spacious and large square at the corner of the current Estonia puiestee and Georg Otsa street.

The project was selected in an international architectural competition, architect Max Höppener, engineer Carl Gustav Jacoby.

The main facade of the three-story, flat-roofed historicist building is articulated by a portico with rustic pilasters, which ends with a triangular pediment.

In 1921, the artist, the school's art and drawing teacher Roman Nyman gave the cap its final shape and colour, which stands today.

It was probably during that time when the cap, made of black fabric, with golden stripes on the sides and zigzags on the bottom, got the right to life and remained a symbol and hallmark of the school for more than twenty years.

[3] As previously written, since the red occupation that began in 1940, the making of school badges was prohibited, which meant that there was a need for a symbol that would unite all the graduates of Reaalkool.

But then it was concluded that the version with oak leaves was not suitable, and Heino Juurikas, a student in the final grade, who was good at drawing, made a new design - the letter "R" in a dozen corners on a round black enamel plate.

In addition, the design of the oak leaves and text was slightly different, and the pattern around the school badge did not have the dot that current rings have.

[14] Tallinna Peetri Reaalkool, founded in 1881, received its first flag as a gift from the parents in 1884, when the school's new building was ceremonially opened.

On September 28, 1991, i.e. the eve of the 110th anniversary, a new school flag was consecrated in Kaarli Church, with the inscription Tallinna Reaalkool and the letter R at the end.

In 1923, the marble plaque was opened in the school’s assembly hall for Anton Õunapuu, a teacher who fell in the War of Independence, and four students of Reaalkool - Harald Trigel, Gunnar Dobka, Artur Sisask and Eugen Seeberg.

The hazing begins with an introduction party on Saturday, includes various competitions and culminates with a flash mob and the blessing of new high school students.

In 1998, at the suggestion of the students of Reaalkool, the monument was relocated to the green area in front of Tallinn Secondary School of Science.

[18] Every year before the anniversary of the Republic, the student councils and principles of the three Tallinn schools that took part in the War of Independence (Tallinn Secondary School of Science, Jakob Westholm Gymnasium and Gustav Adolf Gymnasium) lay a joint wreath on the statue of students and teachers who fell in the War of Independence.

At the same time, students are also given scholarships from funds created to promote the activities of Tallinn Secondary School of Science.