Of our students made to the semifinal round of the TJ Prep exam last year. Of those, 75% were offered admission.   


test a week

To solidify concepts and practice before the November test, we offer an optional testing time to take practice tests in a test-taking environment in our office.



students max

Our focus is on the students. We teach toward their individual learning styles so that each student gets the most out of the class. 


Not your average TJ Prep class. 


No Cram Zone

The admissions exam for the Thomas Jefferson High School for Science & Technology received a makeover in 2017. 

According to the Fairfax County Public Schools press release, "A combination of two different tests--the ACT Aspire and the Quant Q--were selected to replace the old test. The ACT Aspire test will test reading and science skills, and the Quant Q will test math skills ... These tests replace the previous exam and will be administered on November 18."

Without any examples of the new test, we are going back to the basics. We have created our own proprietary TJ materials to focus on the concepts behind the test. In addition, we'll cover test-taking strategies to ensure that your student is ready and confident on test day.

The semifinalist round remains the same with the SIS/Essay Test. Read more on our TJ SIS/Essay page.



The New TJ Test








50 min

65 min

60 min


# of Qs






Pattern Recognition

Probability Combinatorics

Out-of-the-Box Algebra

Geometry + Optimization

Key Ideas + Details

Craft + Structure

Integration of Knowledge
+ Ideas

Interpretation of Data

Scientific Investigation

Evaluation of Models


Experimental Design


TJ Admissions Schedule

2018 - 2019


1st Round

September 3 - 28, 2018

Testing Date:
Saturday, November 10, 2018

**Applicants receive semifinalist notification
on January 18, 2019



Teacher Recommendation Information Due:
January 25, 2019

SIS/Essay Test:
Saturday, February 9, 2019

Teacher Recommendation Deadline:
February 11, 2019


Admissions Decisions:
April 30, 2019

How does it work?


Step 1

Schedule a diagnostic at our office.

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Step 2

We'll call or email with an assessment.


Step 3

Register for a class or sign up for private tutoring.

Principia 2018-2019 TJ Schedule


7th Grade TJ Prep 2018-2019



January 6th - June 2nd

*Off March 31 for Spring Break

2 - 4pm

(21 weeks)


February 10th - June 2nd

11 am - 1 pm

(17 weeks / accelerated)



*We are opening another 7th grade TJ class on Sundays!

March 3rd - June 2nd

4 pm - 6:30 pm

(14 weeks / accelerated)

Tuition: $1490

1 spots left


November 10th - June 1st

*Off for Thanksgiving, Christmas, New Year's, and Spring Break

2 - 4 pm

(25 weeks)


January 12 - June 1st

*Off March 30th for Spring Break

5:30 - 7:30 pm

(20 weeks)



Summer 2019 Prep Classes

Summer TJ Prep 1A Advanced*

Mondays & Wednesdays

June 24th - July 17th

9 am - 1 pm

4 weeks

Tuition (textbooks included): $1,375

*Students must test into course

Summer TJ Prep 1B

Tuesdays & Thursdays

June 25th - July 18th

9 am to 1 pm

4 weeks

Tuition (textbooks included): $1,375


Summer TJ Prep 2A

Mondays & Wednesdays

July 22nd - August 14th

9 am - 1 pm

4 weeks

Tuition (textbooks included): $1,375

Summer TJ Prep 2B

Tuesdays & Thursdays

July 23rd - August 15th

9 am to 1 pm

4 weeks

Tuition (textbooks included): $1,375


Thank you for your hard work and for a great class. My student has looked forward to coming to class every weekend and is disappointed it will end. I was so glad I contacted you all after such negative experiences with other educational groups.
— Parent
Quality, Professionalism, Environment, Timeliness.
My child loves the instructors, the welcoming environment, and the structured teaching techniques. We have seen an increase in confidence AND grades! We definitely recommend Principia Tutors.
— Alex N., Ashburn, VA
Thank you for all you’ve done. Whatever the outcome, we have been so happy with the transformation we have seen. She is so much more confident and doing so well at school. It was wonderful seeing her eyes light up when she understood a complex concept or problem. We loved your teaching style and how fun you made the lessons.
— S., Parent

Interested in private tutoring? Get in touch for more information.