Hey there hope you're doing well.
Dear aspirant, yes there is a scope for diploma students for admissions at NITs IITs and SPAs but for that they need to appear for the JEE MAIN &ADVANCED examinations. There is no age limit for appearing in JEE MAIN examination but the candidate must have passed their class 12th from a recognised institute in the appearing or previous year. After appearing in JEE MAIN you must take part in josaa counselling to acquire a seat at NITs and SPAs. For admissions at IITs you need to first clear JEE MAIN then appear for JEE ADVANCED and clear it and then further appear for AAT- Architecture Aptitude Test.
I'm providing you with a link for more info please carefully go through it's eligibility criteria.
Link - (fir jee main & architecture) https://engineering.careers360.com/articles/jee-main-eligibility-criteria.
For admissions at SPA 10+3 diploma courses is mentioned in eligibility criteria.
Thank you hope this helps you!

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