I've started visiting swimming pool and I'm a little bit concerned. I'm a poor swimmer and I'm trying to work on my style. I've heard that I need 3:30 on 200m to get B and validate swimming at the beginning. I've done 4:38 with breaststroke today and after few minutes I've swum 600m in 14:55 which is 4:59 per every 200m. So I can't swim any faster. I remember doing 1km in 24:40 in February so it's the same pace and I haven't been to swimming pool since then. I know I should be faster in crawl stroke but I still need to work a lot on my technique. I'm a runner so I've got endurance. I'm going to take some swimming lessons for the month remaining. My question is what happens when I don't make it in 3:30? Is there a time limit for a C grade? I'm worried that I could have troubles with swimming through whole four years.