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had a question on limits what does the negative and positive sign mean next to limits like limit x approaching 2- then x approaching 2+, how would i solve questions with these limits

Hey guys So for prelims i do Eco, Bio, CHemistry, 3 U math, slr and adv english I am thinking to drop either eco or bio next year as i dont like either but just might keep bio. Since i have to drop slr either away and then if i choose to drop eco as well, what do you recommend to pick up?