Canada Visa

Yes, universities do take a close look at the number of backlogs. Most of the top good universities do not accept more than 6 (or 8) backlogs. For top universities, it would be max 2. Secondly, they would also look at the CGPA in the last 2 years (4 semesters).

For under graduation degree, the requirement is 55% in academic and IELTS is of 6 band only. Hence you are eligible to get admission, you can try in all the colleges or universities.

Please avoid going to Canada with low scores. Take the test again and score better. There's chances of visa rejection andissues with jobs and PR.

https://www.isamigrations.com/blog/study-in-canada-after-10th
Use the link.

Please do not go to Canada with 5.5 in any module. If at all there arises a case of visa rejection, you might invite a loss of about 1 Lacs. It's better to re attempts
IELTS exam and get a better score card. Also get some small work experience. Nothing major since you just passed class 12th. Also, you have a gap of more than 1 year. Show proof to close that gap.

Yes, the study gap would be a major problem. But, it must be okay, if you did something productive during the gap, eg work. You can give it a try. But, I would suggest you not to keep your hopes up. There's a high chance for visa rejection if you cannot provide proof of activities done during your gap.

Eligibility: To qualify for a Canadian study permit, you need to:
Be enrolled at a designated learning institution
Show proof of funds to cover your tuition fees, living costs, return travel
Have no criminal record
Be in good health (you might need to complete a medical exam)
Prove that you will be leaving Canada after your studies.