Can I score 200+ marks in Jee mains April if I am getting 100 marks in January exam.I got low marks due to lack of problems solving.

Yes yash, you can of course score 200 + if you scored 100 in first attempt. The important thing to keep in mind is during these two months do not try to study anything new. Do not try to change your problem solving method or do not try to read a topic that you have not touched before. Just relax and pay attention to whatever you have studied up until now and practice regularly atleast for 6-7 hours. Fully dedicate yourself to solving Various kinds of questions in all three subjects- physics, chemistry and mathematics. It would be great if you could join a test series as it will help you improve your speed as well as accuracy. Also solve the past years question papers of all three subjects and try to do so within the Time limit. Focus on the concepts and practice as many different types of questions as possible. Revise all the topics regularly and do not waste even a day. You will easily score 200+ if you dedicatedly study and work hard.

Good luck!

If you are facing problem in your problem solving part then this means that you are anylising the problem a bit slowly and then attempting it. So, it could be a bit tough for you to score 200+ but its not impossible because you are having almost 2 months in your hand so practice a bit more by keeping the time limit in your mind in order to increase your speed.