Hello student you can appear in DU Btech if you ful fill the eligibility criteria which says - Candidates must passed or appearing class 12 with physics chemistry and mathematics with minimum 60 percent marks from a recognized board. Admission is on the basis of marks obtained in DUET entrance examination. Prefer NCERT to build your basic concept and make sure you do each and every example and exercise questions of Ncert before jumping to a reference book after completing ncert thoroughly refer to your coaching material or any reference book as mentioned below -

1)concept of Physics HC VERMA

2)Rd Sharma

3)OP TONDON CHEMISTRY

For more updates refer to the link mentioned below - https://www.google.com/amp/s/engineering.careers360.com/articles/du-btech/amp

Feel free to comment if you have any doubt

Good luck