Its a bit hectic for the students who is filling counseling forms nowadays. my answer is not only for jossa aspirants but for any engineering counseling .For choice filling :-Firstly check the cutoff list for 2021 and 2021 and analyse the trends. See how much increase/decrease was there, what were the best branches that saw a massive increase in cutoffs and also see the arrangement of colleges like which one has the highest cutoffs and all these things.Then choose your areas of interest as every college has some or the other different branch or specialization mostly which might interest you so note it.Then comes the most important task of knowing what you can get.This task should be done in three steps.1. Colleges/branches you want to get but are a bit/ very out of range for you.2. Colleges/branches you should surely get.3. If JOSAA is your only hope and you know you have to get into it anyhow then this section is for you because you need Backups so less preffered branches in good colleges and then just average branches and colleges for the worst case scenario.Write them out and arrange them. Since there is no limit to filling, fill as much as you can. Also be patient. Make an informed choice. Research things. Ask me for comparisons of all sorts like x vs y and i will tell you all the pros and cons and will help you make a choice. Analyse what others are getting in mock rounds and keep making changes. Dont lock them immediately. Just keep saving them but make sure to lock them 24 hours before the deadline and save a copy of it for future reference to know what you can get in upcoming rounds.Now once you get something, you will have to report to the nearest iit for admission to an iit or nearest nit in case you got an nit allotted.You will be given three options. 1. Internal sliding: if you want to hold on to the college you got and want to opt for branch upgrade in that college only.2. Complete sliding, both branch and college might get upgraded to a higher choice.3. No change! You want to lock your seat and withdraw from sliding.Also, once you get a choice say of number 19, in sliding never can you get anything filled beyond 19. So fill wisely. Because there is no going back to the ignored choices!Also, know your priorities, whether it is college life so then go for any branch in a great college, whether it is interest, whether it is placements or further studies or any such priority and then choose!Just dont run for tags, branch will matter as it will be you who will be studying the course chosen for 4or 5years.So make a good choice for yourself!All the best! All doubts and queries are welcome!in http://quora.com comment section .cheers.