Hi

To be honest scoring 240/300 in jee main is not a very easy task but by studying with dedication and perseverance you can definitely achieve it. And to help you to prepare and score well , we have jEE main knockout program , the link for the same is provided below

https://learn.careers360.com/knockout-jee-main

I am assuming you from general category

With 240 marks,

Your percentile will be around 99.84  and rank will be around 1637 - 1840 as per :-

It's difficult to make prediction but,

When we go through previous year trend then ,

In round 6 of josaa counselling 2020 , for  gender neutral to get computer science engineering   , closing rank  in nit trichy for general category is provided below

Under other STATE

• General/open:-        781

Under HOME STATE quota

• General/open:-    4728

You can check the same at

https://josaa.nic.in/Result/Result/currentorcr.aspx

So, from above it is clear that with expected rank 1637 - 1840, your chances are low for computer science in NIT Trichy under other state quota but if you have home state quota then you have very good chances for computer science in NIT Trichy

Thank you