Hello,

In term of admission,

as you have mentioned you took 3 years of gap, it could be somewhat difficult for you to take admission in the top institutes of the country but you will get admission in a good college or institute if you score well in UGAT exam. Selection criteria is different for every college, but still you can try to take admission in some best colleges.

In terms of placements,

however, it could be very problematic when it comes to placement, as it shows your inconsistency, some companies don't prefer candidate who take gap of more than one year. In your case 3 years gap could be your weak point but, you will get the job if you convince the recruiters by explaining and giving  a valid reason.

Good Luck.