Hii,

Yes it is 100% possible to crack NEET just by studying online. Actually, the mode of preparation doesn't matter for selection in NEET. See, NEET tests a candidate's accuracy and speed. This exam tests how a student performs under pressure. Many students got selected just by studying online. Mode of preparation in the least of your concern. You should be truthful to yourself irrespective of from where you're preparing. You should be consistent with your preparation. You should be very disciplined, then only you can crack an exam, be it NEET or some other exam. As long as you're studying and working hard, online or in-person preparation doesn't matter.

Yes, u can.

But along with that u have to practice previous years question papers and be consistent. Make ur understanding strong and try to finish ur paper before the time end. Read NCERT books daily and make short notes to understand anything and u have to make key points and give mock tests a lot.

Hope this will help u. Goodluck.