Dear sir,

According to you, your son got 98.34 percentile in JEE mains 2021. Then according to this  percentile, your rank  may be start from 16982 - 19090 .

JEE main rank cut-off for DTU CSE (2020)

As you know,

DTU is very good university. It has good infrastructure and placements. More than 80% students were placed in campus placement. The average package was 10 LPA.   The lowest package offered was 3.2 LPA . In 2018, the highest placement offer was 1.2 Crores per annum. Top recruiter of this college are Google, Amazon, Apple, Flipkart,  Microsoft IDC, Samsung, , etc.

To know more : (1) JEE Main Rank Predictor 2021 - Predict your JEE Main 2021 Rank, JEE Main Percentile Calculator (careers360.com)

(2) Delhi Technological University (DTU) Delhi: Admission 2021, Courses, Fee, Cutoff, Ranking, Placements & Scholarship (careers360.com)

(3) College Predictor 2021 - Predict Colleges for Engineering, Medical, Law and More (careers360.com)

Good luck : )