Hi Student,

You can pursue B.tech after completing your diploma degree.You can also go for B.Arch after diploma in Architectural Assistanship.Candidates who completed their engineering diploma are able to apply for B.tech lateral entry programs.In most engineering colleges there is a reserved seat for lateral entry.You are able to get admission into second year.

To know further details about joining B.Tech after your diploma go through the below link
https://engineering.careers360.com/articles/b-tech-after-polytechnic
Hope this will be helpful.
Best of luck.