Hello nath,
The 68 percentile was good . You havnt mentioned your reservation category. For suppose let calculate the general rank of yours  the estimated rank will be 258880 . With this rank in your home state quota you can grab 1.civil engineering 2.production engineering 3. Mathematic and computing 4.mechanical engineering.
If you have any reservation please mention in comment section for better answer
https://www.google.com/amp/s/engineering.careers360.com/articles/jee-main-cutoff-for-nit-agartala/amp
You can check here cut off of previous year
All the best

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