hey,

yes you can pursue diploma in engineering after you 10+2 and also after your 10nth too , diploma in engineering is of 3 years , after completing your diploma inn engineering you will get direct admission in 2 year of b.tech , you can pursue diploma in any of the streams , there are many some of them are listed below

1. diploma in computer science engineering

2. diploma in civil engineering

3. diploma in mechanical engineering

4. diploma in electrical engineering

5. diploma in textile engineering

the average fee structure of this course is around INR 30k-1 lakh , there will be total 6 semesters ,admission will be done on the basis of merit.

hope this helps

good luck!