PEC Chandigarh and NIT Meghalaya, neither of them are good colleges as of now due to some major reasons. 

NIT Meghalaya:

• NIT Meghalaya is situated in the northeastern part of India and it is a newly built NIT. 
• It now comes at the bottom among all the NITs of our country. This is because of the poor and temporary management faculty and it doesn't even have a campus of its own. 
• The placements here are currently very poor as this college is newly built. It will take its time to get exposure and recognition which can attract top companies to visit for campus placements. 

PEC Chandigarh:

• PEC Chandigarh is not a great college as students scoring lower ranks like 40k or more can also get admission at PEC.
• The placement records are also very poor here. And being at PEC Chandigarh you will also not get the NITian tag which can be very helpful while looking for jobs. 

It is suggested to take a year drop and start preparing for JEE Main properly and aim to score higher marks. Appear for the January exam and not the April exam as almost every student targets for it and it can be very difficult to score higher rankings as competition will get very tough. January exam will have less competition and it will be easy to get higher rankings which can indeed open possibilities to get admission in one of the top IITs or NITs.