Recommendation Letters

It shouldn’t matter when you had that teacher, their recommendations should still be valid. You should definitely double check the requirements and see if it specifies. The teacher recommendations that look the best for colleges would be from classes you did well in and that are also relevant to what you’ll be majoring in at college.

Yeah, it shouldn't matter what year you had the teacher, especially if you know that the teacher really knows you and sees your full potential. But if for some reason it is a rule at you school then it would be better to listen to your guidance counselors.

It shouldn’t matter when you had that teacher, their recommendations should be accepted. You should definitely double check the requirements and see if it specifies. The letter of recommendations that look the best for colleges would be from classes you did well in, but you can also get them from counselors as well as your principle. But my suggestion to you, is try to get as many letter of recommendation letters because it'll be benefical for you before you apply for colleges.

Hi! As far as I know, you just have to make sure the teacher that writes your recommendation letter had the opportunity to see how hard you worked in that class and the results (which, from your answer I asume were good) of that work. It is advised that you ask at least two teachers, one from a STEM subject, and the other from the languages/humanities category, and in my school it doesn't matter if it is an elective or not, as long as you are certain that the teacher knows you well enough to write a well-executed letter, which can mean a great deal at admissions. Strictly from the logical point of view, you must have made a good impression on your teacher if they offered themselves, so I wouldn't be worried on that point, and as chemistry is generally considered a 'difficult' subject, it would be great as one of the letters from the STEM category.

some schools prefer teachers to be from a recent classes but as long as you interact with the teacher consistently it would count as recent. Any way doesn't really matter as Lon as you have a specific and well written letter.